Drawing and stamping die, shaping die and process surface modeling method for automobile central channel

Abstract

This invention discloses a drawing and stamping die for an automotive center console, a forming die, and a method for shaping the process surface. The drawing and stamping die includes an upper die base, a lower die base, a die cavity, an upper pressure ring, a punch, and a lower pressure ring. The lower pressure ring is located on both sides of the punch. The die surface of the punch is used to shape the main body of the protruding automotive center console. The drawing parting line between the punch and the die cavity is located at the bottom of the side wall of the main body. The lower pressure ring has a U-shaped groove corresponding to the grooves on both sides of the automotive center console. The U-shaped groove is used to draw and form the initial grooves of the grooves on both sides of the automotive center console, and at the same time, the U-shaped groove is used to form the drawing ribs of the die on the blank holder surface. When designing the supplementary surface of the drawing process, this die eliminates the additional supplementary surface in the traditional drawing process, thereby improving material utilization and reducing the drawing difficulty of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile parts manufacturing, in particular to a drawing and stamping die and a shaping die for manufacturing an automobile central channel. The present invention also relates to a drawing and stamping process surface shaping method for an automobile central channel. Background Art

[0002] With the continuous in-depth research and widespread application of automobile lightweighting, the reduction in vehicle weight directly leads to the optimization of stamping part structure, which requires not only higher strength but also lighter weight.

[0003] The central channel of the car is located in the middle of the floor between the driver and the front passenger, and has high requirements for collision safety. Its overall dimensions and height fluctuations are large, the drawing depth exceeds 150mm, and there are through grooves on both sides. The existence of the grooves makes the absolute height difference of the parts reach 170mm. Crack defects are very likely to occur during the drawing process, and it is usually very difficult to fully draw and form them in one go.

[0004] The material of the central channel is usually HC340 / 590DP, with a thickness of 1.0mm or 1.2mm. It is usually completed in four steps. The first step is drawing, the second step is trimming, the third step is shaping, and the fourth step is punching. The most important of the four steps are drawing and shaping. Most of the product's profile is completed in the first step, and the final shape and size requirements are achieved through the third step.

[0005] In order to allow the material to flow smoothly during the drawing process, the product needs to be extended with a smooth process supplementary surface through design software, designed into a box-shaped, closed or semi-closed digital model, and then the stamping direction of the drawing process is determined and the draw ribs are set.

[0006] At present, there are two main drawing schemes most commonly used for automobile central channel parts. The first is direct drawing of the entire surface, and the second is local flattening, drawing and then flanging.

[0007] like Figure 1 , Figure 2 The full-surface direct drawing scheme shown in the figure produces a central channel 1′ of the automobile with a part size of 1400*570*220mm, a material of HC340 / 590DP, a material thickness of 1.2mm, a sheet size of isosceles trapezoid 1460*(930+1090), and a material utilization rate of 69%. The stamping process is OP10 drawing (obtaining the drawing process part 2′) → OP20 trimming and punching → OP30 shaping → OP40 trimming and punching.

[0008] like Figure 3 , Figure 4The partial flattening, drawing and flanging scheme shown in the figure produces a 1″ automobile central channel part with an overall dimension of 1300*500*200mm, a material of HC340 / 590DP, a material thickness of 1.0mm, a sheet size of isosceles trapezoid 1360*820, and a material utilization rate of 68%. The stamping process is OP10 drawing → OP20 trimming and punching → OP30 flanging → OP40 trimming and punching.

[0009] The above two solutions each have certain limitations. The full-surface direct drawing process has certain restrictions on the product structure and material selection. Only when the product drawing depth is not high (depth <200mm) and the part material elongation is high can it be guaranteed that there will be no drawing cracks inside the product. The product profile is completely located on the punch, and the front and rear ends are in a non-closed state. The planes on both sides of the product are extended out of the process supplementary surface, and then the pressing surface is set. The height of the pressing surface must be lower than the lowest point of the product, and corresponding drawing ribs are set on the pressing surface; the local flattening, drawing and flanging process is suitable for products with straight flange surface characteristics on both sides to ensure that the flanging will not have defects such as wavy wrinkles.

[0010] Moreover, since both solutions require setting draw ribs on the drawing press surface to control the amount of material inflow and ensure that there are no wrinkling and stacking defects on the product surface, the sheet size needs to be appropriately increased and the material utilization rate is low, generally 65%~75% (depending on the product structure), which increases the production cost. Summary of the invention

[0011] The purpose of the present invention is to provide a drawing and stamping die for a central channel of an automobile. When designing the drawing process supplementary surface, the die eliminates the extra supplementary surface in the traditional drawing process, thereby improving the material utilization rate and reducing the drawing difficulty of the product.

[0012] Another object of the present invention is to provide a vehicle central channel drawing and shaping die used in conjunction with the vehicle central channel drawing and stamping die.

[0013] Another object of the present invention is to provide a method for shaping the drawing and stamping process surface of an automobile central channel using the drawing and stamping die and shaping die of the automobile central channel.

[0014] To achieve the above-mentioned purpose, the present invention provides a drawing and stamping die for a central channel of an automobile, comprising an upper die base, a lower die base, a die and an upper pressure ring arranged on the upper die base, and a punch and a lower pressure ring arranged on the lower die base, the lower pressure ring being located on both sides of the punch, the mold profile of the punch being used to shape the main body of the protrusion of the central channel of the automobile, the drawing parting line between the punch and the die being located at the bottom of the side wall of the main body, the lower pressure ring being provided with a "U"-shaped groove corresponding to the grooves on both sides of the central channel of the automobile; the "U"-shaped groove is used to draw and form the prototype grooves of the grooves on both sides of the central channel of the automobile, and the "U"-shaped groove is used to form the drawing ribs of the mold on the pressing surface.

[0015] Preferably, the "U"-shaped groove is located outside the drawing parting line and passes through the pressing surface of the lower edge holding ring.

[0016] Preferably, in the punching direction, the "U"-shaped groove is concave.

[0017] Preferably, the bottom of the "U"-shaped groove is in a smoothly transitional shape.

[0018] Preferably, the depth of the lowest point of the "U"-shaped groove is less than the depth of the lowest points of the grooves on both sides of the central channel of the automobile, and the difference between the two is greater than or equal to 4 mm.

[0019] Preferably, the radius of the bottom of the "U"-shaped groove is R18~R22.

[0020] Preferably, the two first rounded corners at the opening of the front end portion of the "U"-shaped groove are R8-R12, and the two second rounded corners at the bottom of the front end portion of the "U"-shaped groove are R18-R22.

[0021] To achieve the above-mentioned other purpose, the present invention provides a drawing and shaping die for the central channel of an automobile, comprising a shaping upper die seat and a shaping lower die seat, the shaping upper die seat being provided with an upper pressure core located in the center and shaping inserts located on both sides of the upper pressure core, an upper pressure ring being provided on the outer side of the shaping insert; the shaping lower die seat being provided with a shaping punch located in the center and lower pressure rings located on both sides of the shaping punch; during the shaping process, the shaping insert can draw the prototype groove into grooves on both sides of the central channel of the automobile.

[0022] Preferably, the lower pressure ring is located outside the prototype groove.

[0023] To achieve the above-mentioned another object, the present invention provides a method for shaping the drawing and stamping process surface of a central channel of an automobile, comprising a drawing process, a trimming process, a shaping process and a punching and trimming process;

[0024] In the drawing process, the automobile central channel drawing stamping die described in any one of the above items is used to stamp the sheet material into a drawing process part, wherein the drawing process part has a main body part of the automobile central channel protrusion and a prototype groove;

[0025] In the shaping process, any of the above-mentioned automobile central channel drawing and shaping dies is used to draw the prototype groove into grooves on both sides of the automobile central channel through shaping.

[0026] The present invention adjusts the position of the drawing parting line of the drawing stamping die, moves the drawing parting line inward to the bottom of the side wall of the highest drawing part of the product, and designs the modeling surface of the outer side of the drawing parting line for forming the grooves on both sides of the product as a draw rib modeling, that is, the "concave" groove surface modeling on the left and right sides of the original product is changed to a "U"-shaped groove, and the modified "U"-shaped groove is used as a draw rib to replace the draw ribs of the traditional drawing process to control the amount of material inflow. This mold, which designs the product groove modeling surface not on the punch but on the pressing surface, uses the existing modeling surface of the product to change the groove modeling to a modeling similar to the draw rib, and replaces the draw rib to play a role in restricting the flow of materials. The purpose of controlling the material can be achieved without increasing the size of the sheet material, and the unnecessary process supplementary parts outside the product trimming line can be reduced. The material utilization rate is increased by at least 10%, which not only improves the material utilization rate, but also reduces the difficulty of product drawing.

[0027] In a preferred embodiment, by subjecting the product profile to a smooth transition treatment, the bottom surfaces of the grooves on both sides can be subjected to a large radius transition, and during drawing, the material flow resistance is greatly reduced, which can effectively avoid the occurrence of cracking defects.

[0028] The automobile central channel drawing and shaping die provided by the present invention is used in conjunction with the automobile central channel drawing and stamping die. The automobile central channel drawing and stamping process surface modeling method provided adopts the automobile central channel drawing and stamping die and the shaping die. Since the automobile central channel drawing and stamping die has the above-mentioned technical effects, the automobile central channel drawing and shaping die and the automobile central channel drawing and stamping process surface modeling method should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is the process flow chart of the full-surface direct drawing solution;

[0030] Figure 2 It is a structural schematic diagram of a drawing process part obtained in the drawing process by the full-surface direct drawing scheme;

[0031] Figure 3 This is the process flow chart of the local flattening, drawing and flanging solution;

[0032] Figure 4It is a structural schematic diagram of a drawn process part obtained in the drawing process by the local flattening, drawing and flanging scheme;

[0033] Figure 5 A schematic structural diagram of a drawing and stamping die for a central channel of an automobile disclosed in an embodiment of the present invention;

[0034] Figure 6 for Figure 5 The schematic diagram of the position of the drawing parting line of the drawing and stamping die of the central channel of the automobile is shown;

[0035] Figure 7 A cross-sectional diagram for comparing the drawing process part with the final product;

[0036] Figure 8 for Figure 7 A partial enlarged view of the A part;

[0037] Fig. 9 A front-end schematic diagram for comparing the drawing process parts with the final product;

[0038] Fig.10 for Fig. 9 A partial enlarged view of the B area;

[0039] Fig.11 A schematic structural diagram of a drawing and shaping die for a central channel of an automobile disclosed in an embodiment of the present invention;

[0040] Fig.12 It is a flow chart of a method for modeling a drawing and stamping process surface of a central channel of an automobile disclosed in an embodiment of the present invention;

[0041] Fig.13 The figure is a schematic structural diagram of an automobile central channel product manufactured by adopting the solution provided by the present invention.

[0042] Figures 1 to 4 middle:

[0043] Automobile central channel 1′ and drawing process part 2′ Automobile central channel 1″ and drawing process part 2″.

[0044] Figures 5 to 13 middle:

[0045] 1. Car central channel 2. Upper die seat 3. Lower die seat 4. Punch 5. Die 6. Upper pressure ring 7. Lower pressure ring 8. Drawing parting line 9. "U"-shaped groove 10. Prototype groove 11. Groove 12. First fillet 13. Second fillet 21. Plastic upper die seat 22. Plastic lower die seat 23. Upper pressure core 24. Plastic insert 25. Upper pressure ring 26. Plastic punch 27. Lower pressure ring. DETAILED DESCRIPTION

[0046] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0047] In this article, the terms "upper, lower, left, right" and the like are established based on the positional relationships shown in the drawings. The corresponding positional relationships may also change depending on the drawings, and therefore cannot be understood as absolute limitations on the scope of protection; moreover, relational terms such as "first" and "second" and the like are merely used to distinguish one component from another with the same name, and do not necessarily require or imply any actual relationship or order between these components.

[0048] Please refer to Figure 5 , Figure 6 , Figure 5 A schematic structural diagram of a drawing and stamping die for a central channel of an automobile disclosed in an embodiment of the present invention; Figure 6 for Figure 5 Schematic diagram of the position of the drawing parting line of the drawing and stamping die of the central channel of an automobile.

[0049] As shown in the figure, in a specific embodiment, the automobile central channel drawing and stamping die provided by the present invention is used to process and manufacture the automobile central channel 1, which is mainly composed of an upper die base 2, a lower die base 3, a punch 4, a die 5, an upper pressure ring 6, a lower pressure ring 7 and other parts, wherein the die 5 and the upper pressure ring 6 are installed on the upper die base 2, the punch 4 and the lower pressure ring 7 are installed on the lower die base 3, and the lower pressure ring 7 is located on both sides of the punch 4. The automobile central channel 1 is roughly in the shape of a "J" in cross section, with symmetrical horizontal flanges on both sides, and each side of the flange has a groove 11 extending in the longitudinal direction. The mold surface of the improved punch 4 is used to shape the raised main part of the automobile central channel 1, and the drawing parting line 8 between the punch 4 and the die 5 is located at the bottom of the side wall of the main part.

[0050] The drawing parting line 8 of the mold is moved inward to the bottom of the side wall of the highest drawing part of the product, so that during the molding process, sufficient material can flow into the cavity without causing material rupture defects.

[0051] The lower pressure ring 7 is provided with a "U"-shaped groove 9 corresponding to the grooves on both sides of the central channel 1 of the automobile. The "U"-shaped groove 9 is located on the outside of the drawing parting line 8 and passes through the pressing surface of the lower pressure ring 6. During the stamping process, this "U"-shaped groove 9 is used to draw and form the prototype groove 10 of the grooves on both sides of the central channel 1 of the automobile, and at the same time is used to form the drawing ribs of the mold on the pressing surface.

[0052] Please continue to refer to Figure 7 , Figure 8 , Figure 7A cross-sectional diagram for comparing the drawing process part with the final product; Figure 8 for Figure 7 A partial enlarged view of .

[0053] As shown in the figure, the product surface shape outside the drawing parting line 8 is designed as a drawing rib shape, that is, in the stamping direction, the "U"-shaped groove 9 is concave in shape, and its bottom is in a smooth transition shape. The two first fillets 12 at the opening of the "U"-shaped groove 9 are R8~R12, and the fillet size of the "U"-shaped groove bottom 9 is R18~R22. The depth of the lowest point of the "U"-shaped groove 9 is less than the depth of the lowest point of the groove 11 on both sides of the central channel 1 of the car, and the difference between the two is greater than or equal to 4mm.

[0054] For example, the lowest point of the concave shape is 4.4mm higher than the product, and the radius is R20. This can prevent the trimmed parts from being unable to be placed in place when they are placed in the punch of the shaping process.

[0055] Please refer to Fig. 9 , Fig.10 , Fig. 9 A front-end schematic diagram for comparing the drawing process parts with the final product; Fig.10 for Fig. 9 A partial enlarged view of .

[0056] As shown in the figure, considering that the groove 11 of the central channel 1 of the automobile becomes shallower and wider at the front end, the front end corresponding to the "U"-shaped groove 9 no longer has a smooth transition through a semicircular fillet, but has a straight portion at the bottom and two second fillets located on both sides of the straight portion, wherein the two first fillets 12 at the opening of the front end portion of the "U"-shaped groove 9 are R8~R12, and the two second fillets 13 at the bottom of the front end portion of the "U"-shaped groove 9 are R18~R22.

[0057] For example, the first fillet 12 can be adjusted from the original R6 to R10, and the second fillet 13 can be adjusted from the original R9 to R20, both of which enlarge the fillets. The larger the fillet, the more conducive it is for material to flow in, making it easier to achieve the groove shape during shaping.

[0058] Please refer to Fig.11 , Fig.11 The present invention is a schematic structural diagram of a drawing and shaping die for a central channel of an automobile disclosed in an embodiment of the present invention.

[0059] To achieve the above-mentioned other purpose, the present invention provides a drawing and shaping die for the central channel of an automobile, which is mainly composed of a shaping upper die base 21, a shaping lower die base 22, an upper pressure core 23, a shaping insert 24, an upper pressure ring 25, a shaping punch 26, and a lower pressure ring 27.

[0060] The upper pressing core 23 is arranged at the central position of the shaping upper die seat 21, the shaping inserts 24 are located on both sides of the upper pressing core 23, the upper pressure ring 25 is arranged on the outside of the shaping insert 24, the shaping punch 26 and the lower pressure ring 27 are arranged on the shaping lower die seat 22, the shaping punch 26 is located in the center of the shaping lower die seat 22, the lower pressure ring 27 is located on both sides of the shaping punch 26, and the lower pressure ring 27 is located on the outside of the prototype groove 10. By making a pressure design on the outside of the prototype groove 10, the material can achieve plastic deformation. During the shaping process, the shaping insert 24 can draw the prototype groove 10 on the drawing process part into the grooves 11 on both sides of the central channel of the car.

[0061] The above embodiments are only preferred solutions of the present invention, and are not limited thereto. On this basis, targeted adjustments can be made according to actual needs to obtain different implementation methods. For example, the size of the transition fillet of the "U"-shaped groove 9 can be adaptively adjusted, or, according to different actual products, the molding surfaces of the punch 4 and the shaping punch 26 are in other shapes, etc. Since there are many possible implementation methods, they will not be described one by one here.

[0062] Please refer to Fig.12 , Fig.13 , Fig.12 It is a flow chart of a method for modeling a drawing and stamping process surface of a central channel of an automobile disclosed in an embodiment of the present invention; Fig.13 The figure is a schematic structural diagram of an automobile central channel product manufactured by adopting the solution provided by the present invention.

[0063] As shown in the figure, the material of the automobile central channel 1 product is generally B340 / 590DP, and the material thickness is generally 1.0~1.2. It is completed through four stamping processes: OP10 drawing → OP20 trimming → OP30 shaping → OP40 punching and trimming. Among them, the drawing and shaping processes are the most important to the quality of parts.

[0064] The automobile central channel drawing and stamping process surface shaping method provided by the present invention abandons the previous shaping method and is essentially different from the traditional method. The drawing process does not draw the grooves on both sides at one time, but first draws most of the product surface, and then draws the grooves on both sides on the basis of the prototype groove through shaping, including the following steps:

[0065] OP10 drawing process - This process is the first process of stamping and the most critical process of stamping. When working, the automobile central channel drawing stamping die described in any of the above items is used to place a straight rectangular sheet on the lower pressure ring 7 of the lower die of the drawing die. During the downward process of the press, the sheet slowly fits the die surface. When it reaches the lowest point, a drawing process part is obtained. This drawing process part has the raised main part of the automobile central channel 1 and the prototype groove 10.

[0066] OP20 trimming process - In this process, the edges of the drawn parts are processed to remove the excess parts around them.

[0067] OP30 shaping process - in this process, any of the above-mentioned automobile central channel drawing and shaping dies is used to shape the prototype groove 10 into grooves 11 on both sides of the automobile central channel to obtain a shaping process part.

[0068] OP40 Punching and Trimming Process - This process punches the required holes in the shaping process, processes the edges of the parts in the drawing process, and cuts off the parts that exceed the product boundary.

[0069] The present invention changes the "concave" groove surface shape on the left and right sides of the original product into a "U"-shaped groove 9, and uses the modified "U"-shaped groove 9 as a draw rib to replace the draw rib of the traditional drawing process to control the amount of material inflow. This mold, in which the product groove shaping surface is not designed on the punch but on the pressing surface, changes the groove shaping to a similar draw rib shaping by utilizing the existing shaping surface of the product, and replaces the draw rib to play a role in restricting the flow of materials. Without increasing the size of the sheet material, the purpose of controlling the material can be achieved, and unnecessary process supplementary parts outside the product trimming line can be reduced. The material utilization rate is increased by at least 10%, which not only improves the material utilization rate, but also reduces the difficulty of product drawing. It is well applicable to various types of middle channel products.

[0070] The above is a detailed introduction to the automobile central channel drawing and stamping die, shaping die and process surface modeling method provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A drawing and stamping die for a central channel of an automobile, comprising an upper die base (2), a lower die base (3), a concave die (5) and an upper pressure ring (6) arranged on the upper die base (2), and a convex die (4) and a lower pressure ring (7) arranged on the lower die base (3), wherein the lower pressure ring (7) is located on both sides of the convex die (4), and is characterized in that: The mold profile of the punch (4) is used to shape the protruding main part of the automobile central channel (1); the drawing parting line (8) between the punch (4) and the die (5) is located at the bottom of the side wall of the main part; the lower pressure ring (7) is provided with a "U"-shaped groove (9) corresponding to the grooves (11) on both sides of the automobile central channel (1); the "U"-shaped groove (9) is used to draw and form the prototype grooves (10) of the grooves (11) on both sides of the automobile central channel (1); and the "U"-shaped groove (9) is used to form the drawing ribs of the mold on the pressing surface.

2. The automobile central channel drawing and stamping die according to claim 1, characterized in that: The "U"-shaped groove (9) is located outside the drawing parting line (8) and passes through the pressing surface of the lower edge holding ring (7).

3. The automobile central channel drawing and stamping die according to claim 2, characterized in that: In the stamping direction, the "U"-shaped groove (9) is concave in shape.

4. The automobile central channel drawing and stamping die according to claim 3, characterized in that: The bottom of the "U"-shaped groove (9) is in a smoothly transitional shape.

5. The automobile central channel drawing and stamping die according to claim 4, characterized in that: The depth of the lowest point of the "U"-shaped groove (9) is less than the depth of the lowest points of the grooves on both sides of the central channel of the vehicle, and the difference between the two is greater than or equal to 4 mm.

6. The automobile central channel drawing and stamping die according to claim 4, characterized in that: The fillet size of the bottom of the "U"-shaped groove (9) is R18-R22.

7. The automobile central channel drawing and stamping die according to claim 4, characterized in that: The two first rounded corners (12) at the opening of the front end portion of the "U"-shaped groove (9) are R8-R12, and the two second rounded corners (13) at the bottom of the front end portion of the "U"-shaped groove are R18-R22.

8. A drawing and shaping die for a central channel of an automobile, which is used for drawing and shaping a workpiece processed by the drawing and stamping die for the central channel of an automobile according to claim 1, characterized in that: The invention comprises a shaping upper die seat (21) and a shaping lower die seat (22), wherein the shaping upper die seat (21) is provided with an upper pressing core (23) located in the center and shaping inserts (24) located on both sides of the upper pressing core (23), and an upper pressure ring (25) is provided on the outer side of the shaping insert (24); the shaping lower die seat (22) is provided with a shaping punch (26) located in the center and lower pressure rings (27) located on both sides of the shaping punch (26); during the shaping process, the shaping insert (24) can draw the prototype groove (10) into grooves (11) on both sides of the central channel (1) of the automobile.

9. The automobile central channel drawing and shaping die according to claim 8, characterized in that: The lower pressure ring (27) is located outside the prototype groove (10).

10. A method for shaping the drawing and stamping process surface of a central channel of an automobile, characterized in that: It includes drawing process, trimming process, shaping process and punching and trimming process; In the drawing process, a central channel drawing stamping die for an automobile as claimed in any one of claims 1 to 7 is used to stamp a sheet material into a drawing process part, wherein the drawing process part has a protruding main body part of the central channel (1) of the automobile and a prototype groove (10); In the shaping process, the automobile central channel drawing and shaping die as claimed in claim 8 or 9 is used to draw the prototype groove (10) into grooves (11) on both sides of the automobile central channel (1) through shaping.

Images