A drawing die drawing rib structure and design method
By designing open draw beads and adding spherical crown shapes in the drawing die, the problem of poor venting in high-frequency production was solved, and controllable flow and high-quality forming of the parts were achieved.
Patent Information
- Application Number
- CN202310704624.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-06-14
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2043-06-14
AI Technical Summary
In high-frequency, high-speed production processes, poor venting of the draw beads in the drawing die can lead to insufficient part forming, affecting the size and appearance of the part.
Open draw beads are designed in specific areas of the drawing die, and spherical crowns are added to the open areas to solve the problem of poor venting.
In high-frequency, high-speed production, ensuring rapid gas discharge enables controllable flow speed of sheet metal, thereby improving the forming quality and dimensional accuracy of the parts.
Smart Images
Figure CN116833310B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of stamping, and relates to a drawing die drawing rib structure and a design method. BACKGROUND
[0002] As the most important die in the whole process die, the drawing process of the stamping part directly determines the quality of the stamping part. As an important control element of the sheet forming quality in the drawing die, the drawing rib is particularly important. With the development of the automobile industry, the production frequency of stamping parts is increasing, and the production frequency per minute exceeds 14 times. The improvement of production speed brings new problems to the production of stamping parts.
[0003] In the forming process of the drawing die of the stamping part, a drawing rib structure is designed to control the flow of the sheet. The concave rib is designed on the pressure pad, and the convex rib is designed on the concave die. Before the forming of the part, the concave die and the pressure pad are closed to form the drawing rib. After the forming starts, the pressure pad controls the sheet flow speed by the resistance of the sheet flowing through the drawing rib.
[0004] Referring to Figure 1 , the concave rib groove of the drawing rib is generally closed, so that the gas is compressed and cannot be discharged in the concave rib groove. In the traditional case, the problem of gas discharge is solved by increasing a small-diameter exhaust hole in the concave rib groove. In the case where a small resistance coefficient is required and the production frequency is not high, this method can solve the problem of gas discharge in the drawing rib concave rib groove.
[0005] For the square drawing dead rib with high rib height, in the process of high-frequency and rapid production, due to the fast closing speed of the press, the compressed gas cannot be smoothly discharged in the concave rib groove. When the production frequency reaches a certain value, the gas pressure rises sharply, and the concave die bears a large reverse force, which causes the drawing part rib to be unable to fully form and the designed resistance coefficient to be unable to be reached. In the forming process of the part, the sheet flow speed of the part is out of control, which leads to the deterioration of the size and surface quality of the part.
[0006] Patent document CN110479869A provides a stamping die drawing rib groove structure, an outline profile forming method and a stamping die. The stamping die drawing rib groove structure of the present application comprises a rib groove body formed on the pressure pad or the pressure surface of the concave die in the stamping die, and along the extension direction of the pressure surface, the rib groove body is in the length direction. The rib groove body is composed of a wave shape formed by a circular arc segment connected in turn. The stamping die drawing rib groove structure of the present application can make the flow-in speed of the part different at each part of the drawing rib in the extension direction of the pressure surface, so as to control the flow-in speed of the part through the shape of the drawing rib, lock the material, reduce the pressure of the part on the side wall of the drawing rib, and reduce the wear of the drawing rib.
[0007] The utility model provides a novel mechanical drawbead structure, including upper die and lower die, die includes upper die holder, stripper plate and punch, lower die includes lower die holder and lower die plate, both sides of drawbead structure that the lower die plate is symmetrical is fixed on the lower die holder, the drawbead structure includes stand, movable plate and top block, the stand is fixed on the lower die holder, the movable plate is slidably installed on the stand, spring is equipped between the movable plate and the lower die holder, the inner end of movable plate is equipped with the drawbead that cooperates with the drawbead slot on the stripper plate, the upper die holder is equipped with the top block that moves and contacts with the outer end of movable plate.
[0008] The utility model discloses a round drawbead is with drawbead die, including lower die plate and upper die plate, the lower die plate's upper end is fixedly installed with lower pressing edge ring, the lower pressing edge ring's upper end is fixedly installed with lower alignment seat, the lower alignment seat four sides lower die support base is fixed with the lower guide column limit seat, the lower die support base on the lower alignment seat lower end is equipped with the top plate limit hole.
[0009] The above patent documents have low relevance to the present application. SUMMARY
[0010] The present application solves the technical problems of the prior art, provides a drawbead structure and design method for a drawbead die.
[0011] It should be noted that in this paper, such as the first and second relationship terms are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the term "includes", "contains" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.
[0012] To solve the above technical problems, the present application is realized by using the following technical scheme:
[0013] This invention solves the problem of poor venting of the draw beads in drawing dies by designing open draw beads in areas where the sheet metal flow is low or non-flowing. Furthermore, it addresses the issue of uneven sheet metal flow caused by variations in the drag coefficient in these open draw bead areas by adding spherical cap shapes.
[0014] A drawing bead structure for a drawing die, characterized in that:
[0015] Make the closed drawbar into an open structure in the area closer to the corner;
[0016] The width of the rib protrusion in the closed region is a = 12 mm;
[0017] The width of the ductwork protrusion in the open area is b = 16 mm;
[0018] The width of the concave groove in the closed region is d = (b + 0.3 + t) mm;
[0019] The width of the recessed groove in the open area is c = (a + 0.3 + t) mm;
[0020] t represents the thickness of the sheet metal.
[0021] Furthermore, the height h of the rib protrusion in the closed region is the same as the height in the open region;
[0022] The height of the recessed groove in the open area is h1 = (h + 1.5) mm.
[0023] Furthermore, a spherical crown shape is added to the open area of the drawbar.
[0024] Furthermore, the center of the spherical crown is set at the open rib position, E1≈E2, F=12mm.
[0025] Furthermore, the height of the spherical crown in the groove of the pressure ring is H = (h1-1) mm, the radius is R = 8 mm, and the bottom angle is R1 = 2 mm.
[0026] Furthermore, the raised rib is machined into a concave shape according to the size of the spherical crown in the concave rib groove. The gap size between the concave shape and the spherical crown in the concave rib groove is g = (t + 0.3) mm, and R2 = 3 mm.
[0027] Furthermore, the number of drawbars can be 2 or 4.
[0028] A method for designing draw beads for drawing dies, characterized in that:
[0029] Closed drawbars are made into open drawbars in areas close to the corners.
[0030] Furthermore, a spherical crown shape is added to the open area of the drawbar.
[0031] Further, the spherical cap center position is set at the position shown by the open rib, E1≈E2, F=12mm;
[0032] The spherical cap height in the blank holder ring concave rib groove is (h1-1)mm, the radius R=8mm, and the bottom angle R1=2mm.
[0033] Compared with the prior art, the beneficial effects of the present application are:
[0034] The present application can solve the exhaust problem in the draw bead concave rib groove in the case of high production frequency. For the square draw locking rib with high rib height, the draw part rib can be fully formed to achieve the designed resistance coefficient in the high-frequency rapid production process. In the part forming process, the part sheet flow speed is controllable, and the part size and surface quality meet the requirements. BRIEF DESCRIPTION OF DRAWINGS
[0035] The present application will be further described below in conjunction with the drawings:
[0036] Figure 1 Schematic diagram for setting the draw bead of the traditional draw die
[0037] Figure 2a Schematic diagram of the draw die structure
[0038] Figure 2b Schematic diagram of the draw bead Figure 2a Partial enlarged view at A
[0039] Figure 3a Schematic diagram of the draw bead in the initial state
[0040] Figure 3b Schematic diagram of the draw bead Figure 3a Partial enlarged view at B
[0041] Figure 4 Schematic diagram of the draw bead structure of the draw die according to the present application
[0042] Figure 5 Schematic diagram of the draw bead Figure 4 Partial enlarged view at C
[0043] Figure 6a Schematic diagram of the concave rib groove Figure 1 ;
[0044] Figure 6b Schematic diagram of the draw bead Figure 6a Partial enlarged view at D
[0045] Figure 6c Schematic diagram of the concave rib groove Figure 1 ;
[0046] Figure 6d Schematic diagram of the draw bead Figure 6c Partial enlarged view at E
[0047] Figure 7a Extruded rib Figure 1 ;
[0048] Figure 7b Extruded rib Figure 7a Detail at F
[0049] Figure 7c Extruded rib
[0050] Figure 7d Extruded rib Figure 7c Detail at G
[0051] Figure:
[0052] 1. Punch
[0053] 2. Die
[0054] 3. Upper base plate
[0055] 4. Extruded rib
[0056] 5. Part
[0057] 6. Die rib groove
[0058] 7. Extruded rib
[0059] 8. Die cross-section
[0060] 9. Extruded rib cross-section
[0061] 10. Part sheet metal
[0062] 11. Drawn rib DETAILED DESCRIPTION
[0063] In order to make the purposes, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more details below in combination with the accompanying drawings in the embodiments of the present application. In the accompanying drawings, identical or similar labels represent identical or similar elements or elements with identical or similar functions from beginning to end. The described embodiments are part of the embodiments of the present application, rather than all the embodiments. The embodiments described below in combination with the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below in combination with the accompanying drawings.
[0064] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application.
[0065] The present application will be described in detail below with reference to the accompanying drawings:
[0066] Referring to Figure 1 , the drawing bead is generally closed. When high-frequency rapid production is carried out, the drawing bead with a large resistance coefficient is closed, and the gas in the closed space is not easily discharged, resulting in an increase in the pressure in the closed cavity, which affects the closing of the pressure ring and the concave die.
[0067] Referring to Figure 2a , Figure 3a , Figure 3b , in the initial state of production, the movable part pressure ring 1 is in the raised state, the concave die 2 is gradually closed with the descending upper base plate 3, and the closed cavity is formed between the workpiece sheet metal and the pressure ring concave bead. With the closing process, the gas in the closed cavity is continuously compressed, and the pressure gradually increases. Referring to Figure 2b , when the closing is completed, due to the inability of the gas to be quickly discharged, the concave die 2 is subjected to the upward force of the compressed gas, which affects the closing of the pressure ring 1 and the concave die 2 to the bottom, resulting in insufficient drawing bead forming. After the drawing bead forming is completed, the convex die 4 contacts the workpiece, and the workpiece begins to form. At this time, due to the insufficient drawing bead forming, the expected sheet metal flow control effect cannot be achieved, resulting in size and surface problems of the workpiece.
[0068] To solve this problem, the closed drawing bead is made into an open structure drawing bead. As Figure 4 , Figure 5 shown. Arranged in the area where the workpiece has less or no material flow.
[0069] Referring to Figure 2a , Figure 2b , Figure 3a , Figure 3b , the closed drawing bead is made into an open structure drawing bead in the area close to the corner, so that the compressed gas is discharged from the open area. The number of arrangements is 2 or 4.
[0070] Referring to Figure 5 , two symmetrical positions.
[0071] Referring to Figure 7a , Figure 7b , Figure 7c ,Figure 7d , the closed area draw bead protrusion width a = 12mm, the open area draw bead protrusion width b = 16mm, the closed area draw bead protrusion height h is same as the open area height.
[0072] Referring to Figure 6a , Figure 6b , Figure 6c , Figure 6d , the recess groove width c = (a + 0.3 + t) mm, t represents the thickness of the sheet, the closed area recess groove width d = (b + 0.3 + t) mm, referring to Figure 7d , the open area recess groove height h1 = (h + 1.5) mm.
[0073] a represents the closed area draw bead protrusion width;
[0074] b represents the open area draw bead protrusion width;
[0075] h represents the closed area draw bead protrusion height;
[0076] The closed area recess groove width d = (b + 0.3 + t) mm;
[0077] The open area recess groove width c = (a + 0.3 + t) mm;
[0078] The problem brought by the open draw bead is that the resistance coefficient of the open area draw bead is locally small. The sheet material will have the problem of uneven flow.
[0079] To solve this problem, the application increases the spherical cap shape in the open area of the draw bead, without affecting the exhaust condition, increases the resistance coefficient of the sheet material flowing through this area, thereby ensuring that the gas is quickly discharged during high-frequency rapid production, while not affecting the forming performance of the workpiece.
[0080] The spherical cap center position is arranged at the position of the open bead, E1≈E2, F = 12mm.
[0081] F is a point value, and the point position made according to E1, E2, F value is a determined position.
[0082] E1, E2, F three parameters are respectively the spherical cap center distance from three edges.
[0083] The spherical cap height H = (h1-1) mm in the draw bead recess groove, the radius R = 8mm, and the bottom angle R1 = 2mm.
[0084] The draw bead recess groove is arranged on the draw bead, and the draw bead recess groove is arranged on the draw bead.
[0085] The convex rib is processed concave according to the spherical cap size in the concave rib groove, and the concave is the same as the spherical cap gap size g=(t+0.3)mm, R2=3mm.
[0086] t represents the thickness of the plate material;
[0087] R2 represents the concave curvature radius of the concave in the convex rib.
[0088] The present application solves the problem of poor exhaust of square drawing rib with large resistance coefficient in the drawing process in the high-frequency rapid production of stamping parts, thereby solving the quality problems of surface quality and size of stamping parts caused by poor exhaust.
[0089] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, any modification, equivalent replacement and improvement within the technical range disclosed by the present application and within the spirit and principle of the present application should be covered within the protection scope of the present application. Meanwhile, the contents not described in detail in the specification are all the existing technology known by the skilled in the art.
Claims
1. A structure of drawbead in drawing die, characterized in that: the closed drawbead is made into open drawbead in the area close to the corner; the width of the convex bead of the closed area drawbead is a=12mm; the width of the convex bead of the open area drawbead is b=16mm; the width of the concave groove of the closed area drawbead is d=(a+0.3+t)mm; the width of the concave groove of the open area drawbead is c=(b+0.3+t)mm; t represents the thickness of the sheet metal; the height of the convex bead of the closed area drawbead is the same as that of the open area; the height of the concave groove of the open area drawbead is h1=(h+1.5)mm; a spherical cap is added in the open area of the drawbead; the center of the spherical cap is arranged at the position of the open bead, E1≈E2, F=12mm; the height of the spherical cap in the concave groove of the binder is H=(h1-1)mm, the radius is R=8mm, and the bottom angle is R1=2mm; E1, E2, and F are respectively the distances from the center of the spherical cap to the centers of the three sides.
2. The structure of drawbead in drawing die according to claim 1, characterized in that: the convex bead is processed into a concave shape according to the size of the spherical cap in the concave groove, and the size of the gap g=(t+0.3)mm between the concave shape and the spherical cap in the concave groove is R2=3mm; R2 represents the concave radius of the concave shape in the convex bead.
3. The structure of drawbead in drawing die according to claim 1, characterized in that: the number of the drawbead is 2 or 4.
4. A method for forming the structure of drawbead in drawing die according to any one of claims 1 to 3, characterized in that: the closed drawbead is made into open drawbead in the area close to the corner; a spherical cap is added in the open area of the drawbead; the center of the spherical cap is arranged at the position of the open bead, E1≈E2, F=12mm; the height of the spherical cap in the concave groove of the binder is H=(h1-1)mm, the radius is R=8mm, and the bottom angle is R1=2mm; E1, E2, and F are respectively the distances from the center of the spherical cap to the centers of the three sides. 4. A method of designing a drawbead in a draw die, characterized by:
Citation Information
Patent Citations
Stamping die drawing rib groove structure and contour forming method and stamping die
CN110479869A
Novel mechanical draw bead structure
CN215544226U
Drawing die for circular draw bead
CN215824083U
Drawing die for forming metallic sheet by punching
CN1342532A