Forming die assembly for B column of new energy automobile

Abstract

The utility model discloses a forming die assembly for a column B of a new energy automobile. After a blank plate enters from the forming die assembly, five forming procedures are carried out in the forming die assembly to obtain two forming products which are symmetrical left and right; a female die forming a die cavity is connected to the upper die assembly, and a plurality of upper inserts which are adjacent to the female die, made of hard materials and detachably connected to the upper die assembly are arranged on the periphery of the female die. A plurality of lower inserts which are made of hard materials and detachably connected to the lower die assembly are arranged on the periphery of the male die, and the lower inserts are adjacent to the male die. And the upper insert and the lower insert form a die cavity of the process step after die assembly. After the upper insert and the lower insert are arranged, on one hand, stress inside a product is released through hard materials, the difference value of main strain and auxiliary strain is further reduced, on the other hand, the inserts can be conveniently rectified and adjusted in the later period through detachable connection, and therefore abrasion is resisted.

Description

Technical Field

[0001] The utility model relates to the technical field of forming processes, and particularly to a forming die assembly for a B-pillar of a new energy vehicle. Background Art

[0002] Generally, there are three types of columns in a car body, namely the front column A-pillar, the middle column B-pillar, and the rear column C-pillar in sequence from front to back. For a car, these columns not only play a supporting role but also serve as door frames. Among them, the B-pillar is located between the front seat and the rear seat of the cockpit. It extends from the roof to the bottom of the vehicle, is the main part supporting the vehicle's structural strength, and is also the position where the seat belt is installed. Therefore, its functions are reflected in supporting the passenger compartment frame, protecting the members' safety, and providing strength support for vehicle body anti-collision. Thus, the rigidity and strength of the B-pillar play a very important role among the vehicle's components. In the prior art, the automotive B-pillar is usually a plate formed by die hot forming. However, due to the material of the product being a high-strength plate with a tensile strength of 811 MPa, the stretching of this plate is very difficult, it is hard to reach the yield strength of the plate, the requirements for equipment are relatively high, the forming force during forming is huge, and it is extremely easy to cause uneven distribution of internal stress after forming, resulting in large springback and distortion of the formed product. Especially for the automotive B-pillar, the product itself has a small height, a large length and width, fewer internal profiles, and shallow ribs on the surface, so its own rigidity is particularly poor. As shown in the schematic diagram of the automotive B-pillar Figure 1 in the attached figure, the product has a long length, and the four corners are all in an outward-expanded shape, and there are many small-area local concave and convex structures in the middle. And according to the analysis results of the direct stretching process plan in the prior art, it has the following disadvantages:

[0003] 1. The product is severely distorted, and its distortion value reaches as much as ±10 mm. Specifically, for the 4 corners of the product, there is a tendency that 2 diagonal corners are upturned and the other 2 diagonal corners are downturned, and it cannot meet the dimensional requirements;

[0004] 2. The main strain on the large area of the product is uneven, and no effective extension is formed; the secondary strain is negative, and there is compressive strain; the reasons obtained from the above main and secondary strain analyses indicate that the difference between the main and secondary strains of the product is very large after stretching, and the internal stress of the product is not released, and the result is that the product shows such a large distortion. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a forming die for a B-pillar of a new energy vehicle that reduces the difference between the main and secondary strains through process optimization, thereby ensuring that the product has less distortion on the premise of not cracking and not warping, so as to ensure that the product meets the requirements.

[0006] To solve the above technical problems, the forming die for the B-pillar of a new energy vehicle provided by the present utility model is such that after the blank plate enters the forming die assembly, five forming processes are carried out within the forming die assembly to obtain two symmetrically formed products on the left and right. And in each forming process, a set of special forming dies is provided. The upper die assemblies of each set of special forming dies are all connected to the upper die fixing plate of the forming die assembly, and the lower die assemblies of each set of special forming dies are all connected to the lower die fixing plate of the forming die assembly; the female die forming the die cavity is connected to the upper die assembly, and the corresponding male die is connected to the lower die assembly; a plurality of upper inserts made of hard materials and adjacent to the female die are arranged around the female die, and the upper inserts are detachably connected to the upper die assembly; a plurality of lower inserts made of hard materials and adjacent to the male die are arranged around the male die, and the lower inserts are detachably connected to the lower die assembly; the upper inserts and the lower inserts form a die cavity with a process step after the die is closed.

[0007] A blanking plate is connected to the lower die assembly of the forming die assembly. One end of the blanking plate is a connecting end located below the punching or trimming position within the die, and the other end is a free end extending outside the die and inclined downward.

[0008] The blanking plate is a plate member with flanges on both sides, and is divided into an upper blanking plate and a lower blanking plate according to the installation position, and the length of the upper blanking plate is less than the length of the lower blanking plate.

[0009] In the forming die of the fifth forming process, on each side of each die cavity, there is a side punching device for punching small holes on the side. Each set of side punching devices is a two-stage punching device, with a vertical stroke and a horizontal stroke respectively.

[0010] The side punching device includes an upper slider, a lower slider, a base, an upper pressing block, a lower pressing block and a punch; wherein, the upper slider and the upper pressing block are connected to the upper die assembly, and the base is connected to the lower die assembly; the upper end of the lower slider is slidably connected to the lower end of the upper slider and is limited in the vertical direction, and the lower end of the lower slider is slidably connected to the upper end of the base; the connecting end of the punch is connected to the end face of the lower slider, and the cutting head end of the punch penetrates through the lower pressing block; the lower pressing block is located below the upper pressing block after the die is closed, and the side of the product is located between the upper pressing block and the lower pressing block.

[0011] The fact that the upper end of the lower slider is slidably connected to the lower end of the upper slider and is limited in the vertical direction means that the lower end of the upper slider has an inverted T-shaped groove, and at both ends of the T-shaped groove, there is a relief groove penetrating through the upper slider. The length direction of the relief groove is perpendicular to the length direction of the T-shaped groove; the T-shaped groove is inclined, and the height of the end close to the die cavity is higher than the height of the other end; the upper end of the lower slider is provided with a positive V-shaped convex strip that slidably cooperates with the T-shaped groove, and the upper slider and the lower slider are limited to prevent the lower slider from separating from the upper slider through the cooperation of the T-shaped groove and the T-shaped convex strip.

[0012] The sliding connection between the lower end of the lower slider and the upper end of the base means that the lower end of the lower slider is provided with an inverted V-shaped groove penetrating through the lower slider, and the upper end of the base is correspondingly an inverted V-shaped surface. The lower slider and the base are slidably matched through the two side walls of the V-shaped surface and the V-shaped groove; both the V-shaped surface of the base and the V-shaped groove of the lower slider matched therewith are inclined, and the height of the end close to the mold cavity is lower than that of the other end.

[0013] A stroke limiting structure is provided between the lower slider and the base. The stroke limiting structure includes an L-shaped convex block provided at the bottom end of the lower slider and a limiting block provided on the base; the L-shaped convex block is located at the edge of one side wall of the V-shaped groove, and the limiting block is located at the edge of one side wall of the V-shaped surface close to the mold cavity, and the limiting block protrudes from the side wall of the V-shaped surface. After the mold is closed, the limiting block is clamped in the L-shaped convex block.

[0014] A guiding inclined surface is provided at the end of the V-shaped groove at the bottom end of the lower slider close to the mold cavity.

[0015] After adopting the above-mentioned forming mold assembly, compared with the prior art, the present utility model has the following advantages:

[0016] 1) Through the optimization of the above five forming processes, the difference between the principal and secondary strains is reduced. It can ensure that the product is free from cracking and warping, reduce distortion, and ensure that the product dimensions meet the requirements through springback compensation, thus greatly improving the quality stability of the product; moreover, concentrating the five forming processes in a dedicated forming mold assembly enables assembly line production, greatly improving production efficiency; with upper inserts made of hard materials provided around the female mold and lower inserts made of hard materials provided around the male mold, on the one hand, the internal stress of the product is released through the hard materials, further reducing the difference between the principal and secondary strains, and on the other hand, the detachable connection enables these inserts to be easily rectified and adjusted later, thereby resisting wear; the process steps formed by these upper inserts and lower inserts play a role in reverse compensation for the surface of the drawing die, thereby further ensuring the product dimensions.

[0017] 2) The blanking plate provided in the mold can timely discharge the waste generated during the mold closing and stamping process, avoiding the phenomenon of these wastes damaging the mold, thereby improving the service life of the mold; in addition, a double-layer blanking plate is provided according to the position of the stamping holes, which can ensure more timely discharge of the waste and prevent the waste on the upper layer from falling and damaging other important parts of the mold.

[0018] 3) The side punching device in the dedicated mold for the fifth forming process punches holes according to the mold closing action of the upper and lower molds and converts the up-and-down movement into a horizontal movement, without the need for an additional driving device, making the mold structure more compact and easier to control the punching process. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the vehicle B-pillar involved in the present utility model.

[0020] Figure 2 It is a schematic structural diagram of the special forming die in the first forming process of the forming die assembly of the present utility model.

[0021] Figure 3 It is a partial schematic structural diagram of the special forming die in the third forming process of the forming die assembly of the present utility model.

[0022] Figure 4 It is a schematic structural diagram of the special forming die after removing the upper die in the fifth forming process of the forming die assembly of the present utility model.

[0023] Figure 5 It is a schematic structural diagram of the side punching device in the present utility model.

[0024] Figure 6 is Figure 5 the exploded structural diagram of.

[0025] Figure 7 is Figure 5 the partial exploded structural diagram in.

[0026] Figure 8 It is a schematic structural diagram of the lower sliding block in the present utility model.

[0027] Wherein: 1. finished product; 2. female die; 3. male die; 4. upper insert block; 5. lower insert block; 6. upper blanking plate; 7. lower blanking plate; 800. side punching device; 8. upper sliding block; 9. lower sliding block; 10. base; 11. punch; 12. upper pressing block; 13. lower pressing block; 14. T-shaped groove; 15. relief groove; 16. T-shaped rib; 17. V-shaped groove; 18. V-shaped surface; 19. limit block; 20. L-shaped convex block; 21. guiding inclined surface. Detailed implementation manners

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0029] In conjunction with Figures 1 to 8As can be seen from the structural schematic diagram of the forming die assembly for the B-pillar of a new energy vehicle, for the forming die assembly of the B-pillar of a new energy vehicle in the present utility model, after the blank plate enters the forming die assembly, five forming processes are carried out in the forming die assembly to obtain two symmetrically formed products 1 on the left and right. And in each forming process, a special forming die is set. The upper die assemblies of each special forming die are all connected to the upper die fixing plate of the forming die assembly, and the lower die assemblies of each special forming die are all connected to the lower die fixing plate of the forming die assembly; the female die 2 forming the die cavity is connected to the upper die assembly, and the corresponding male die 3 is connected to the lower die assembly; a plurality of upper inserts 4 made of hard materials and adjacent to the female die 2 are arranged around the female die 2, and the upper inserts 4 are detachably connected to the upper die assembly; a plurality of lower inserts 5 made of hard materials and adjacent to the male die 3 are arranged around the male die 3, and the lower inserts 5 are detachably connected to the lower die assembly; the upper inserts 4 and the lower inserts 5 form a die cavity with a process step after the die is closed. In this embodiment, there are multiple upper inserts 4, which are arranged around the female die; there are also multiple lower inserts 5, which are arranged around the male die.

[0030] A blanking plate is connected to the lower die assembly of the forming die assembly. One end of the blanking plate is a connecting end located below the punching or trimming position inside the die, and the other end is a free end extending outside the die and inclined downward.

[0031] The blanking plate is a plate member with flanges on both sides. According to the installation position, it is divided into an upper-layer blanking plate 6 and a lower-layer blanking plate 7, and the length of the upper-layer blanking plate 6 is less than that of the lower-layer blanking plate 7. In this embodiment, the upper-layer blanking plate 6 is arranged at one end of the product, and the lower-layer blanking plates 7 are arranged at both ends of the product respectively. And, there is a notch on the upper-layer blanking plate 6 to avoid other components of the die.

[0032] In the forming die of the fifth forming process, on each side of each die cavity, there is a side punching device 800 for punching side small holes. Each group of side punching devices 800 is a two-stage punching device, with a vertical stroke and a horizontal stroke respectively.

[0033] The side punching device 800 includes an upper slider 8, a lower slider 9, a base 10, an upper pressing block 12, a lower pressing block 13 and a punch 11; wherein, the upper slider 8 and the upper pressing block 12 are connected to the upper die assembly, and the base 10 is connected to the lower die assembly; the upper end of the lower slider 9 is slidably connected to the lower end of the upper slider 8 and is limited in the vertical direction, and the lower end of the lower slider 9 is slidably connected to the upper end of the base 10; the connecting end of the punch 11 is connected to the end face of the lower slider 9, and the cutting end of the punch 11 penetrates through the lower pressing block 13; the lower pressing block 13 is located below the upper pressing block 12 after the die is closed, and the side of the product is located between the upper pressing block 12 and the lower pressing block 13.

[0034] The upper end of the lower slider 9 is slidably connected to the lower end of the upper slider 8 and is limited in the vertical direction, which means that the lower end of the upper slider 8 has an inverted T-shaped groove 14. At both ends of the T-shaped groove 14, there is a relief groove 15 penetrating through the upper slider 8. The length direction of the relief groove 15 is perpendicular to and intersects the length direction of the T-shaped groove 14. The T-shaped groove 14 is inclined, and the height of the end close to the mold cavity is higher than that of the other end. The upper end of the lower slider 9 is provided with a positive T-shaped rib 16 that slidably cooperates with the T-shaped groove 14. The upper slider 8 and the lower slider 9 are limited to prevent the lower slider 9 from detaching from the upper slider 8 through the cooperation of the T-shaped groove 14 and the T-shaped rib 16.

[0035] The lower end of the lower slider 9 is slidably connected to the upper end of the base 10, which means that the lower end of the lower slider 9 is provided with an inverted V-shaped groove 17 penetrating through the lower slider 9. The upper end of the base 10 is correspondingly an inverted V-shaped surface 18. The lower slider 9 and the base 10 are slidably mated through the two side walls of the V-shaped surface 18 and the V-shaped groove 17. The V-shaped surface 18 of the base 10 and the V-shaped groove 17 of the lower slider 9 that cooperate with it are both inclined, and the height of the end close to the mold cavity is lower than that of the other end.

[0036] A stroke limiting structure is provided between the lower slider 9 and the base 10. The stroke limiting structure includes an L-shaped protrusion 20 provided at the bottom end of the lower slider 9 and a limiting block 19 provided on the base 10. The L-shaped protrusion 20 is located at the edge of one side wall of the V-shaped groove 17, and the limiting block 19 is located at the edge of one side wall of the V-shaped surface 18 close to the mold cavity end, and the limiting block 19 protrudes from the side wall of the V-shaped surface 18. After the mold is closed, the limiting block 19 is clamped in the L-shaped protrusion 20.

[0037] A guiding inclined surface 21 is provided at the end of the V-shaped groove 17 at the bottom end of the lower slider 9 close to the mold cavity.

[0038] In this embodiment, before the mold is closed, the lower slider 9 slides to the lowest position due to its own weight and is blocked by the groove wall of the relief groove on the upper slider 8. When the mold is closed, the upper mold drives the upper slider 8 to move downward until the V-shaped groove 17 at the lower end of the lower slider 9 abuts against the V-shaped surface 18 on the base 10. The upper mold continues to move downward, and the lower slider 9 is restricted by the base 10 and slides along the V-shaped surface 18, moving in the direction close to the mold cavity, driving the punch 11 to move towards the mold cavity until the L-shaped protrusion 20 of the lower slider 9 is clamped with the limiting block 19 on the base 10 and then stops moving. At this time, the punch 11 completes the punching. When the mold is opened, the upper mold moves upward and moves in the reverse order of the mold closing operation.

[0039] The above are only the preferred and feasible implementation examples of the present utility model, and thus cannot limit the scope of rights of the present utility model. For those skilled in the art, any other corresponding changes or substitutions made by using the technical solutions and technical concepts of the present utility model shall fall within the scope of protection of the claims of the present utility model.

Claims

1. A molding die assembly for a B-pillar of a new energy vehicle, characterized in that: After the blank plate enters the forming mold assembly, it undergoes five forming processes in the forming mold assembly to obtain two left-right symmetrical formed products (1), and a pair of special forming molds is set in each forming process, the upper mold assembly of each pair of special forming molds is connected to the upper mold fixing plate of the forming mold assembly, and the lower mold assembly of each pair of special forming molds is connected to the lower mold fixing plate of the forming mold assembly; the concave mold (2) forming the mold cavity is connected to the upper mold assembly, and the corresponding convex mold (3) is connected to the lower mold assembly; the concave mold (2) is surrounded by a plurality of upper inserts (4) made of hard material adjacent to the concave mold (2), and the upper inserts (4) are detachably connected to the upper mold assembly; the convex mold (3) is surrounded by a plurality of lower inserts (5) made of hard material adjacent to the convex mold (3), and the lower inserts (5) are detachably connected to the lower mold assembly; the upper inserts (4) and the lower inserts (5) form a mold cavity of a process step after the mold is closed.

2. The forming die assembly for the B-pillar of a new energy vehicle according to claim 1 is characterized in that: A blanking plate is connected to the lower die assembly of the forming die assembly, one end of the blanking plate is a connecting end located below the punching or trimming position in the die, and the other end is a free end extending out of the die and tilted downward.

3. The forming die assembly for the B-pillar of a new energy vehicle according to claim 2 is characterized in that: The blanking plate is a plate with folded edges on both sides, and is divided into an upper blanking plate (6) and a lower blanking plate (7) according to the installation position, and the length of the upper blanking plate (6) is shorter than the length of the lower blanking plate (7).

4. The forming die assembly for the B-pillar of a new energy vehicle according to claim 1 is characterized in that: In the special forming mold of the fifth forming process, side punching devices (800) for punching out small side holes are respectively provided on both sides of each mold cavity, and each set of side punching devices (800) is a secondary punching device, with a vertical stroke and a horizontal stroke respectively.

5. The forming die assembly for the B-pillar of a new energy vehicle according to claim 4 is characterized in that: The side punching device (800) comprises an upper slider (8), a lower slider (9), a base (10), an upper pressure block (12), a lower pressure block (13) and a punch (11); wherein the upper slider (8) and the upper pressure block (12) are connected to the upper die assembly, and the base (10) is connected to the lower die assembly; the upper end of the lower slider (9) is slidably connected to the lower end of the upper slider (8) and is limited in the vertical direction, and the lower end of the lower slider (9) is slidably connected to the upper end of the base (10); the connecting end of the punch (11) is connected to the end face of the lower slider (9), and the blade end of the punch (11) is inserted into the lower pressure block (13); the lower pressure block (13) is located below the upper pressure block (12) after the mold is closed, and the side of the product is located between the upper pressure block (12) and the lower pressure block (13).

6. The forming die assembly for the B-pillar of a new energy vehicle according to claim 5 is characterized in that: The upper end of the lower slider (9) is slidably connected to the lower end of the upper slider (8) and is limited in the vertical direction. The lower end of the upper slider (8) has an inverted T-slot (14), and both ends of the T-slot (14) are respectively provided with a retreat groove (15) that penetrates the upper slider (8), and the length direction of the retreat groove (15) is perpendicular to the length direction of the T-slot (14); the T-slot (14) is inclined, and the height of one end close to the mold cavity is higher than the height of the other end; the upper end of the lower slider (9) is provided with a positive T-shaped convex strip (16) that slidably cooperates with the T-slot (14), and the upper slider (8) and the lower slider (9) are limited by the cooperation of the T-slot (14) and the T-shaped convex strip (16) to prevent the lower slider (9) from being separated from the upper slider (8).

7. The forming die assembly for the B-pillar of a new energy vehicle according to claim 5 is characterized in that: The lower end of the lower slider (9) is slidably connected to the upper end of the base (10) in that the lower end of the lower slider (9) is provided with an inverted V-shaped groove (17) penetrating the lower slider (9), and the upper end of the base (10) is correspondingly an inverted V-shaped surface (18), and the lower slider (9) and the base (10) are slidably matched through the V-shaped surface (18) and the two side walls of the V-shaped groove (17); the V-shaped surface (18) of the base (10) and the V-shaped groove (17) of the lower slider (9) matched therewith are both inclined, and the height of one end close to the mold cavity is lower than the height of the other end.

8. The forming die assembly for the B-pillar of a new energy vehicle according to claim 7 is characterized in that: A stroke limiting structure is provided between the lower slider (9) and the base (10), and the stroke limiting structure comprises an L-shaped protrusion (20) provided at the bottom end of the lower slider (9), and a limiting block (19) provided on the base (10); the L-shaped protrusion (20) is located at the edge of one of the side walls of the V-shaped groove (17), the limiting block (19) is located at the edge of one of the side walls of the V-shaped surface (18) close to one end of the mold cavity, and the limiting block (19) protrudes from the side wall of the V-shaped surface (18), and the limiting block (19) is clamped in the L-shaped protrusion (20) after the mold is closed.

9. The forming die assembly for the B-pillar of a new energy vehicle according to claim 7, characterized in that: A guiding inclined surface (21) is provided at one end of the V-shaped groove (17) at the bottom end of the lower sliding block (9) close to the mold cavity.

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