A drawing die and a method of designing and manufacturing the same

Abstract

The application discloses a drawing die and a design and manufacturing method thereof. The drawing die comprises a female die, a male die and a blank holder. The female die cooperates with the male die to form a cavity for forming a part. The blank holder is located between the female die and the male die and cooperates with the female die to compress a blank. The female die and the blank holder are both provided with drawing ribs. The drawing rib comprises an inner rib and an outer rib. The inner rib and the outer rib are smoothly connected through a transition section. The design and manufacturing method comprises data analysis of a drawing process, design of the drawing process, design of drawing processing data, design of a drawing die structure, processing and assembly of the die, and debugging of the die. The drawing rib structure is designed and reformed, and the manufacturing method is reformed. Therefore, the material utilization rate is improved. Meanwhile, the inlay block structure is adopted to replace the drawing rib area, so that the rigidity of the prepared part is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of die manufacturing, in particular to a drawing die and a design and manufacturing method thereof. BACKGROUND

[0002] With the intensification of global greenhouse effect and energy crisis, energy saving and emission reduction of automobiles is imperative. Under this background, new energy vehicles have developed rapidly, and many emerging forces have emerged at home and abroad, and the competition in the passenger vehicle market is increasingly fierce. In the increasingly competitive environment, it is particularly important to reduce production cost.

[0003] At present, in the automobile covering part stamping die, the drawing rib can be divided into two categories according to the number: single rib and double rib. The conventional double rib structure has two drawing ribs, and there is a flat area between the two drawing ribs, that is, the management surface. The management surface is used to adjust the feeding speed of the blank during die closing, and to ensure that the die and the blank have certain strength and wear resistance. During the die closing process, the blank flows from the outer circle of the double drawing rib to the cavity, and after stamping, the blank outside the cavity, that is, the waste material, is finally formed on the management surface. Due to the existence of the management surface, the size of the waste material is too large, and the material utilization rate is not high. SUMMARY

[0004] Therefore, the present application provides a drawing die and a design and manufacturing method thereof. By modifying the structure of the drawing rib, the material utilization rate is improved, and the die strength of the corresponding area is increased by setting the insert structure in the drawing rib area, thereby improving the stiffness of the prepared parts.

[0005] The present application provides a drawing die, which comprises a concave die, a convex die and a blank holder. The concave die and the convex die cooperate to form a cavity for forming a part. The blank holder is located between the concave die and the convex die and is used to cooperate with the concave die to press the blank. The concave die and the blank holder are both provided with a drawing rib. The drawing rib comprises an inner rib and an outer rib. The inner rib and the outer rib are smoothly connected by a transition section.

[0006] Further, the concave die, the convex die and the blank holder are all provided with a forming surface. The middle part of the forming surface of the concave die is concave inward to form a concave part. The middle part of the forming surface of the convex die is convex outward to form a convex part. The convex part and the concave part cooperate to form a cavity for forming a part. The middle part of the forming surface of the blank holder is hollow to form a hollow part. The drawing rib is located around the concave part of the concave die and around the hollow part of the blank holder.

[0007] Further, the drawing rib comprises a concave rib and a convex rib. The concave rib is located on the blank holder and is arranged around the hollow part. The convex rib is located on the concave die and is arranged around the concave part.

[0008] Further, the concave rib and the convex rib each comprise the inner rib and the outer rib, the inner rib of the concave rib is close to the hollow part of the blank holder, the outer rib of the concave rib is arranged outside the inner rib of the concave rib, the inner rib of the convex rib is close to the concave part of the concave die, and the outer rib of the convex rib is arranged outside the inner rib of the convex rib.

[0009] Further, the inner rib and the outer rib on the blank holder are recessed inward relative to the surface of the blank holder, and the inner rib and the outer rib on the concave die are protruded outward relative to the surface of the concave die outside the concave part of the concave die.

[0010] Further, the cross sections of the inner rib and the outer rib on the concave die are each convex arc-shaped, and the cross section of the transition section between the inner rib and the outer rib on the concave die is concave arc-shaped, the cross sections of the inner rib and the outer rib on the blank holder are trapezoidal, and the cross section of the transition section between the inner rib and the outer rib on the blank holder is convex arc-shaped.

[0011] Further, the outer rib on the concave die and the surface of the concave die outside the outer rib, the inner rib on the concave die and the surface of the concave die inside the inner rib, and the bottom corner part between the inner rib and the outer rib on the blank holder are each provided with a concave fillet, and the concave fillet and the transition section between the inner rib and the outer rib on the concave die are each not in contact with the blank during the forming process.

[0012] Further, the radius of the transition section between the inner rib and the outer rib on the blank holder is 0.5-1 times the radius of the inner rib or the outer rib on the concave die.

[0013] Further, the concave die is provided with a concave die insert, and the convex rib is arranged on the concave die insert, and the strength and wear resistance of the concave die insert are greater than the strength and wear resistance of the concave die, respectively.

[0014] Further, the blank holder is provided with a blank holder insert, and the concave rib is arranged on the blank holder insert, and the strength and wear resistance of the blank holder insert are greater than the strength and wear resistance of the blank holder, respectively.

[0015] The application also provides a design and manufacturing method of the drawing die, comprising:

[0016] Data analysis of the drawing process: introducing the original product into the simulation analysis software to perform forming simulation analysis, to obtain reasonable blank holder surfaces, drawing rib reference die surfaces, supplementary surface features, and drawing rib coefficients;

[0017] Design of the drawing process: referring to the forming simulation analysis results in the three-dimensional modeling software to design a complete mold process diagram, to obtain the blank size, the closed mold height, and the feeding height, and to construct the upper die surface and the blank holder die surface profile;

[0018] Designing the drawing process data: based on the obtained die process map, the drawing process data is optimized to obtain the three-dimensional drawing of the upper die surface and the blank holder die surface containing the drawing rib;

[0019] Designing the drawing die structure: based on the obtained die process map, the die structure is designed, and based on the blank size, the closed die height, the feeding height, and the three-dimensional drawing of the upper die surface and the blank holder die surface, the initial structure data of the concave die, the convex die, and the blank holder are obtained, and the optimized upper die surface and blank holder die surface are imported into the reconstructed die surface area to obtain the complete die structure data of the concave die, the convex die, the blank holder, the concave die insert, and the blank holder insert;

[0020] Processing and assembling the die: based on the obtained complete die structure data, the die is processed;

[0021] Debugging the die: based on the complete physical die, the die is debugged to obtain the required die.

[0022] Further, in the data analysis of the drawing process, the obtained drawing rib coefficient includes the drawing rib spacing, the drawing rib width, the drawing rib height, the drawing rib depth, the drawing rib resistance coefficient, and the drawing rib draft angle.

[0023] Further, in the design of the drawing process, the profile of the upper die surface and the blank holder die surface is constructed according to the supplementary surface, the pressure surface, the drawing rib spacing, the drawing rib width, the drawing rib height, the drawing rib draft angle, and the transition area round angle of the inner and outer drawing ribs.

[0024] Further, in the design of the drawing process data, the optimized processing data includes the round angle, the strong pressure compensation, the perturbation compensation, the proportional scaling, and the rebound compensation.

[0025] Further, the processing of the die includes the independent processing and combined processing of the upper die surface, the blank holder die surface, the concave die, the convex die, the blank holder, the concave die insert, and the blank holder insert, and after the combined machining is completed, the concave die insert and the blank holder insert are taken out from the concave die and the blank holder respectively for high-frequency quenching and tempering heat treatment, and then the heat-treated concave die insert and blank holder insert are contacted with the blank surface for nitriding treatment.

[0026] Compared with the existing technology, the present application has the following beneficial technical effects:

[0027] The drawing die and the design and manufacturing method thereof provided by the present application cancel the management surface of the conventional double drawing rib, transition with a convex small arc-shaped transition section, shorten the distance between the inner rib and the outer rib, reduce the size of the waste material, improve the material utilization rate, and thus reduce the manufacturing cost, in addition, the insert structure is adopted instead of the drawing rib area on the concave die and the blank holder, which improves the rigidity of the prepared parts. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 Structure diagram of upper die surface in the present application;

[0029] Figure 2 Structure diagram of blank holder die surface in the present application;

[0030] Figure 3 Structure diagram of die and die insert assembly in the present application;

[0031] Figure 4 Structure diagram of punch in the present application;

[0032] Figure 5 Structure diagram of blank holder and blank holder insert assembly in the present application;

[0033] Figure 6 Structure diagram of die insert in the present application;

[0034] Figure 7 Structure diagram of blank holder insert in the present application;

[0035] Figure 8 Structure diagram of die, punch and blank holder assembly in the present application;

[0036] Figure 9 Structure diagram of cross section when the female rib and the male rib are assembled in the present application;

[0037] Figure 10 Flow chart of the design and manufacturing method of the drawing die in the present application.

[0038] Wherein: 10-upper die surface; 20-blank holder die surface; 30-die; 31-die insert; 32-recess; 40-punch; 42-protrusion; 50-blank holder; 51-blank holder insert; 52-hollow part; 60-drawing rib; 61-female rib; 62-male rib; 63-inner rib; 64-outer rib; 66-transition section; 67-convex fillet; 68-concave fillet; 80-molding surface. DETAILED DESCRIPTION

[0039] The specific embodiments of the present application will be further described in detail below in conjunction with the drawings and examples. The following examples are used to illustrate the present application, but are not used to limit the scope of the present application.

[0040] In the description of the present application, it should be noted that the orientation or positional relationship indicated in the description is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation on the present application.

[0041] Please refer to Figures 1-7 The present application provides a drawing die, comprising a female die 30, a male die 40 and a blank holder 50, the female die 30 cooperates with the male die 40 to form a cavity for forming a part, the blank holder 50 is located between the female die 30 and the male die 40 and cooperates with the female die 30 to press the blank, the female die 30 and the blank holder 50 are both provided with a drawing rib 60, the drawing rib 60 comprises an inner rib 63 and an outer rib 64, and the inner rib 63 and the outer rib 64 are smoothly connected through a transition section 66.

[0042] Specifically, the female die 30, the male die 40 and the blank holder 50 after forming are all provided with a forming surface 80, the middle part of the forming surface 80 of the female die 30 is inwardly recessed to form a recessed part 32, the middle part of the forming surface 80 of the male die 40 is outwardly protruded to form a protruded part 42, and the middle part of the forming surface 80 of the blank holder 50 is hollow to form a hollow part 52, and the drawing rib 60 is located around the recessed part 32 of the female die 30 and around the hollow part 52 of the blank holder 50. The female die 30 and the male die 40 are formed through an upper die surface 10, the upper die surface 10 provides processing data for the forming of the female die 30 and the male die 40, and ensures that the forming surfaces 80 of the female die 30 and the male die 40 correspond to each other in structure. It should be noted that when the data is designed, the shapes of the male die 40 and the female die 30 are basically the same, but the size of the protruded part 42 of the male die 40 is smaller than the size of the recessed part 32 of the female die 30, so that in the process of closing the die, the protruded part 42 of the male die 40 cooperates with the recessed part 32 of the female die 30 to form a cavity that can be used for forming a part. The blank holder 50 is formed through a blank holder die surface 20, and the blank holder die surface 20 provides processing data for the forming of the blank holder 50. The peripheral shapes of the upper die surface 10 and the blank holder die surface 20 are both annular, and the specific shape can be determined according to the actual required processed part. The middle part of the blank holder die surface 20 is hollow, and the peripheral shapes of the female die 30, the male die 40 and the blank holder 50 after forming are also annular, and the specific shape can be determined according to the actual required processed part.

[0043] Please refer to Figure 3 , Figures 5-7 and Figure 9 The drawing rib 60 comprises a concave rib 61 and a convex rib 62, the concave rib 61 is located on the blank holder 50 and is arranged around the hollow part 52, and the convex rib 62 is located on the female die 30 and is arranged around the recessed part 32.

[0044] Further, the concave rib 61 and the convex rib 62 are both double-drawing ribs, and each of the concave rib 61 and the convex rib 62 comprises an inner rib 63 and an outer rib 64. The inner rib 63 of the concave rib 61 is close to the hollow part 52 of the blank holder 50, and the outer rib 64 of the concave rib 61 is arranged outside the inner rib 63 of the concave rib 61. The inner rib 63 of the convex rib 62 is close to the concave part 32 of the die 30, and the outer rib 64 of the convex rib 62 is arranged outside the inner rib 63 of the convex rib 62. The inner rib 63 and the outer rib 64 on the blank holder 50 are concave relative to the surface of the blank holder 50, and the inner rib 63 and the outer rib 64 on the die 30 are convex relative to the surface of the die 30 outside the concave part 32. During the clamping process, the concave rib 61 and the convex rib 62 cooperate to enable the blank to flow therebetween.

[0045] Please refer to Figure 9 The cross sections of the inner rib 63 and the outer rib 64 on the die 30 are both convex arcs, and the cross section of the transition section 66 between the inner rib 63 and the outer rib 64 on the die 30 is a concave arc. The cross sections of the inner rib 63 and the outer rib 64 on the blank holder 50 are similar to trapezoids, and the cross section of the transition section 66 between the inner rib 63 and the outer rib 64 on the blank holder 50 is a convex arc. The radius of the transition section 66 between the inner rib 63 and the outer rib 64 on the blank holder 50 is 0.5-1 times the radius of the inner rib 63 or the outer rib 64 on the die 30.

[0046] During the clamping, the cross sections of the inner rib 63 and the outer rib 64 on the die 30 correspond to the cross sections of the inner rib 63 and the outer rib 64 on the blank holder 50, and the transition section 66 between the inner rib 63 and the outer rib 64 on the die 30 corresponds to the transition section 66 between the inner rib 63 and the outer rib 64 on the blank holder 50. When the blank is fed, the blank is in contact with a plurality of convex round corners 67 (the convex round corners 67 are located between the outer rib 64 on the blank holder 50 and the surface of the blank holder 50 outside the outer rib 64, between the inner rib 63 on the blank holder 50 and the surface of the blank holder 50 inside the inner rib 63, on the inner rib 63 and the outer rib 64 of the die 30, and on the transition sections 66 of the blank holder 50 and the die 30) on the drawing rib 60, and the feeding resistance is realized by the plurality of convex round corners 67. The concave round corners 68 (the concave round corners 68 are located between the outer rib 64 on the die 30 and the surface of the die 30 outside the outer rib 64, between the inner rib 63 on the die 30 and the surface of the die 30 inside the inner rib 63, and at the bottom corner positions of the inner rib 63 and the outer rib 64 on the blank holder 50) corresponding to the convex round corners 67 are designed to be empty, and the concave round corners 68 and the transition sections 66 between the inner rib 63 and the outer rib 64 on the die 30 are not in contact with the blank during the forming process.

[0047] Compared with the conventional double-drawing rib in the prior art, the management surface between the inner rib 63 and the outer rib 64 is cancelled, the arc-shaped transition section 66 is smoothly connected, and the center distance between the inner rib 63 and the outer rib 64 is shortened by one radius R of the inner rib 63 or the outer rib 64, so that the material blocking effect of the drawing rib 60 is ensured, the size of the waste material is reduced, and the utilization rate of the blank is improved.

[0048] Please refer to Figure 3 and Figure 5 In order to further improve the stiffness of the part, the recessed die 30 is provided with a recessed die insert 31 in a partial region around the recessed part 32, the convex rib 62 is arranged on the recessed die insert 31, the blank holder 50 is provided with a blank holder insert 51 in a partial region around the hollow part 52, the concave rib 61 is arranged on the blank holder insert 51, the recessed die insert 31 and the blank holder insert 51 are both steel blocks made of high-strength wear-resistant material, the strength and wear resistance of which are greater than those of the corresponding recessed die 30 and blank holder 50, and the steel blocks are subjected to quenching heat treatment and the profile region is subjected to nitriding process treatment, so that the die strength of the partial region is increased by replacing the die material in the corresponding region with the recessed die insert 31 and the blank holder insert 51, and the wear resistance of the blank is improved, so that the strength of the corresponding region of the part produced is higher.

[0049] As Figure 8 shown, in the stamping work, the recessed die 30 is fixed on the stamping bed, the convex die 40 is fixed below the workbench (the whole convex die 40 is not shown), and the blank holder 50 is fixed on the workbench between the recessed die 30 and the convex die 40. Figure 8 When stamping, the forming surface 80 between the recessed die 30 and the convex die 40 forms a cavity, the blank enters the cavity from the blank holder 50, and the stamping work is performed.

[0050] Please refer to Figure 10 The design and manufacturing method of the drawing die of the present application comprises the following specific steps:

[0051] Step S1, data analysis of the drawing process: import the original product into the simulation analysis software (such as Autoform) to perform forming simulation analysis, and obtain a reasonable pressing surface (blank holder surface), a drawing rib reference die surface (a surface generated by the drawing rib on the pressing surface), a supplementary surface feature (a convex, concave and other features on the process supplementary surface), a drawing rib coefficient (drawing rib spacing, drawing rib width, drawing rib height, material blocking coefficient, drawing rib draft angle), etc.

[0052] Step S2, the design of the drawing process is performed: the complete DL drawing (mold process drawing) is designed in the three-dimensional modeling software (such as CATIA or UG, etc.) with reference to the results of the forming simulation analysis, the required blank size, the closed mold height, the feeding height are obtained, and the approximate profile of the upper die surface 10 and the blank holder die surface 20 (including the supplementary surface, the pressing surface, the drawing rib spacing, the drawing rib width, the drawing rib height, the drawing rib draft angle, the transition area fillet of the inner and outer drawing ribs) is constructed;

[0053] Step S3, the drawing processing data is designed: based on the complete DL drawing obtained in step S2, the processing data is optimized in the CAD software, including but not limited to the fillet removal (the concave fillet on the die surface is removed, especially the fillet at the drawing rib, to avoid material stress concentration, ensure the mold strength, and improve the service life of the mold), the pressure compensation (to deal with the appearance quality problems of the die surface, such as pits, protrusions, deformation, etc.), the perturbation compensation, the scaling (to prevent deformation), the rebound compensation, etc., to obtain a relatively complete three-dimensional drawing of the upper die surface 10 and the blank holder die surface 20 containing the drawing rib 60;

[0054] Step S4, the drawing die structure is designed: based on the complete DL drawing obtained in step S2, the mold structure is designed, based on the blank size, the closed mold height, the feeding height, and the three-dimensional drawing of the upper die surface 10 and the blank holder die surface 20, the initial structure data of the concave die 30, the convex die 40, and the blank holder 50 are obtained, and then the upper die surface 10 and the blank holder die surface 20 with optimized processing data in step S3 are imported into the reconstructed mold surface area to obtain the complete mold structure data of the concave die 30, the convex die 40, the blank holder 50, the concave die insert 31, and the blank holder insert 51;

[0055] Step S5, the mold is processed and assembled: based on the complete mold structure data obtained in step S4, the mold is processed, including the independent processing and combined processing of the upper die surface 10, the blank holder die surface 20, the concave die 30, the convex die 40, the blank holder 50, the concave die insert 31, and the blank holder insert 51. After the combined machining is completed, the concave die insert 31 and the blank holder insert 51 are taken out from the concave die 30 and the blank holder 50 respectively for high-frequency quenching and tempering heat treatment; then the heat-treated concave die insert 31 and blank holder insert 51 are contacted with the blank surface for nitriding treatment, so as to increase the strength of the mold itself and improve the wear resistance of the material;

[0056] Step S6, debugging of the mold is performed: based on the complete physical mold, on-machine debugging is performed, including but not limited to mold closed height (total height of the concave die 30, the convex die 40, the blank holder ring 50 after closing whether it meets the standard), main and auxiliary cylinder tonnage (whether the maximum locking force of the punch meets the standard), secondary round corner (again removing the concave round corner on the mold surface), mold closing rate (fitting degree of the concave die 30, the convex die 40, the blank holder ring 50) and other parameter debugging, finally the required mold is obtained, and then the obtained mold can be used for production of parts.

[0057] In the production of parts, first, the blank is placed on the blank holder ring 50, the concave die 30 is fixed on the punch, the convex die 40 is fixed below the workbench, and the blank holder ring 50 is fixed above the workbench, then the convex die 40 is lifted by the cylinder at the bottom of the workbench, the concave die 30 is controlled to move from top to bottom, the blank is clamped after contacting the blank holder ring 50, then the concave die 30 is controlled to move downward together with the blank holder ring 50, until the concave die 30 stops moving after being subjected to the reverse force of the convex die 40, the convex die 40 and the concave die 30 are separated, the blank is formed, and the production of parts is completed.

[0058] From the above description, it can be known that, by canceling the planar management surface between the conventional double drawing ribs, the transition is performed by an arc-shaped transition section, the distance between the inner rib and the outer rib is shortened, the size of the waste material is reduced, the material utilization rate is improved, and the manufacturing cost is reduced, in addition, the area of the drawing rib provided on the concave die and the blank holder ring is replaced by an insert structure instead of the corresponding mold material, and the stiffness of the prepared parts is improved.

[0059] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A drawing die, comprising a die cavity (30), a punch (40), and a blank holder (50), wherein the die cavity (30) cooperates with the punch (40) to form a cavity for forming a part, and the blank holder (50) is located between the die cavity (30) and the punch (40) for cooperating with the die cavity (30) to press the blank, characterized in that, Both the die (30) and the pressure ring (50) are provided with draw beads (60), the draw beads (60) include inner ribs (63) and outer ribs (64), and the inner ribs (63) and the outer ribs (64) are smoothly connected by a transition section (66); The outer rib (64) on the die (30) and its outer die surface, the inner rib (63) on the die (30) and its inner die surface, and the bottom corners of the inner rib (63) and outer rib (64) on the pressure ring (50) are provided with concave rounded corners (68). The concave rounded corners (68) and the transition section (66) between the inner rib (63) and outer rib (64) on the die (30) do not come into contact with the blank during the forming process. The radius of the transition section (66) between the inner rib (63) and the outer rib (64) on the pressure ring (50) is 0.5-1 times the radius of the inner rib (63) or the outer rib (64) on the die (30); The drawing bead (60) includes a concave bead (61) and a convex bead (62). Both the concave bead (61) and the convex bead (62) include an inner bead (63) and an outer bead (64). The die (30) is provided with a die insert (31). The convex bead (62) is disposed on the die insert (31). The strength and wear resistance of the die insert (31) are greater than those of the die (30). The blank holder (50) is provided with a blank holder insert (51). The concave bead (61) is disposed on the blank holder insert (51). The strength and wear resistance of the blank holder insert (51) are greater than those of the blank holder (50).

2. The drawing die as described in claim 1, characterized in that, The die (30), the punch (40), and the blank holder (50) are all provided with forming surfaces (80). The middle part of the forming surface (80) of the die (30) is recessed inward to form a recessed part (32). The middle part of the forming surface (80) of the punch (40) protrudes outward to form a protruding part (42). The protruding part (42) and the recessed part (32) cooperate to form a cavity for forming parts. The middle part of the forming surface (80) of the blank holder (50) is hollow to form a hollow part (52). The draw bead (60) is located around the recessed part (32) of the die (30) and around the hollow part (52) of the blank holder (50).

3. The drawing die as described in claim 2, characterized in that, The concave rib (61) is located on the pressure ring (50) and is arranged around the hollow part (52), and the convex rib (62) is located on the die (30) and is arranged around the recessed part (32).

4. The drawing die as described in claim 3, characterized in that, The inner ribs (63) and outer ribs (64) on the pressure ring (50) are recessed inward relative to the surface of the pressure ring (50), and the inner ribs (63) and outer ribs (64) on the die (30) protrude outward relative to the outer surface of the die (30) outside the recess (32).

5. The drawing die as described in claim 4, characterized in that, The cross-sections of the inner ribs (63) and outer ribs (64) on the die (30) are both convex arc-shaped, and the cross-section of the transition section (66) between the inner ribs (63) and outer ribs (64) on the die (30) is concave arc-shaped. The cross-sections of the inner ribs (63) and outer ribs (64) on the pressure ring (50) are trapezoidal, and the cross-section of the transition section (66) between the inner ribs (63) and outer ribs (64) on the pressure ring (50) is convex arc-shaped.

6. A method for designing and manufacturing a drawing die according to any one of claims 1-5, characterized in that, include: Data analysis of the drawing process: The original product is imported into the simulation analysis software for forming simulation analysis to obtain reasonable blanking surface, drawbead reference die surface, supplementary surface features and drawbead coefficient; Design of the drawing process: In the 3D modeling software, the complete mold process drawing is designed with reference to the forming simulation analysis results, the blank size, mold closing height and feeding height are obtained, and the outlines of the upper mold surface (10) and the blank holder mold surface (20) are constructed; Design of drawing processing data: Based on the obtained mold process diagram, the processing data is optimized to obtain a three-dimensional diagram of the upper die surface (10) containing the drawing bead (60) and the blank holder die surface (20); Design of drawing die structure: Based on the obtained die process drawing, the die structure is designed. Based on the three-dimensional drawing of blank size, die closing height, feeding height, and upper die surface (10) and blank holder die surface (20), the initial structural data of die (30), punch (40) and blank holder (50) are obtained. The upper die surface (10) and blank holder die surface (20) with optimized processing data are imported into the reconstructed die surface area to obtain the complete die structure data of die (30), punch (40), blank holder (50), die insert (31) and blank holder insert (51). Mold processing and assembly: Mold processing is carried out based on the obtained complete mold structure data; Mold debugging: Based on the complete physical mold, the mold is debugged on the machine to obtain the required mold; When designing the drawing process, the contours of the upper die surface (10) and the blank holder die surface (20) are constructed based on the supplementary surface, blank holder surface, drawbead spacing, drawbead width, drawbead height, drawbead draft angle, and rounded corners of the transition area between the inner and outer drawbeads.

7. The design and manufacturing method of the drawing die as described in claim 6, characterized in that, When performing data analysis on the drawing process, the drawbead coefficients obtained include drawbead spacing, drawbead width, drawbead height, drawbead depth, drawbead resistance coefficient, and drawbead draft angle.

8. The design and manufacturing method of the drawing die as described in claim 6, characterized in that, When designing the drawing process data, the optimized processing data includes fillet clearing, high pressure compensation, deflection compensation, scaling, and rebound compensation.

9. The design and manufacturing method of the drawing die as described in claim 6, characterized in that, The processing of the mold includes the independent processing and combined processing of the upper mold surface (10), the blank holder mold surface (20), the die (30), the punch (40), the blank holder (50), the die insert (31), and the blank holder insert (51). After the combined machining is completed, the die insert (31) and the blank holder insert (51) are taken out from the die (30) and the blank holder (50) respectively for high frequency quenching and tempering heat treatment; then the heat-treated die insert (31) and the blank holder insert (51) are contacted with the blank surface for nitriding treatment.

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