CN112427551A

CN112427551A - Drawing and stamping die, shaping die and technical surface modeling method for automobile central channel

Info

Publication number: CN112427551A
Application number: CN202011260843.7A
Authority: CN
Inventors: 韦毅; 蔡锡斌; 陆静易; 韦乐侠; 蔡辉; 彭文虎; 黄锃; 周林
Original assignee: Liuzhou Wuling Automobile Industry Co Ltd; Guangxi Automobile Group Co Ltd
Current assignee: Liuzhou Wuling Automobile Industry Co Ltd; Liuzhou Wuling Motors Co Ltd; Guangxi Automobile Group Co Ltd
Priority date: 2020-11-12
Filing date: 2020-11-12
Publication date: 2021-03-02

Abstract

The invention discloses a drawing and stamping die for an automobile central channel, a shaping die and a technical surface modeling method, wherein the drawing and stamping die comprises an upper die holder, a lower die holder, a female die, an upper blank holder, a male die and a lower blank holder, the lower blank holder is positioned at two sides of the male die, the die profile of the male die is used for modeling a raised main body part of the automobile central channel, the drawing parting line of the male die and the female die is positioned at the bottom of the side wall of the main body part, and the lower blank holder is provided with a U-shaped groove corresponding to grooves at two sides of the automobile central channel; the U-shaped groove is used for drawing and forming a young groove of grooves on two sides of a central channel of the automobile, and meanwhile, the U-shaped groove is used for forming a drawing rib of the die on the pressing surface. When the die is used for designing the supplement surface of the drawing process, the additional supplement surface in the traditional drawing process is eliminated, so that the material utilization rate is improved, and the drawing difficulty of a product is reduced.

Description

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

Technical Field

The invention relates to the technical field of automobile part manufacturing, in particular to a drawing stamping die and a shaping die for manufacturing an automobile central channel. The invention also relates to a drawing and stamping technical surface modeling method of the automobile central channel.

Background

With the continuous deep research and wide application of the light weight of the automobile, the reduction of the weight of the whole automobile directly brings about the structural optimization of a stamping part, and the requirement on higher strength and lighter weight is met.

The central channel of the automobile is positioned in the middle of the bottom plate between the main driver and the assistant driver, has higher requirements on collision safety, has larger external dimension and height fluctuation, has drawing depth more than 150mm, is provided with through grooves at two sides, ensures that the absolute height difference of parts reaches 170mm due to the existence of the grooves, is very easy to crack in the drawing process, and is usually very difficult to completely draw and form at one time.

The center channel material is usually HC340/590DP, the thickness is usually 1.0mm or 1.2mm, and the four processes are mostly completed, wherein the first process is drawing, the second process is edge cutting, the third process is shaping, the fourth process is punching, the drawing and shaping processes are the most important processes in the four processes, most of the molded surfaces of the product are completed in the first process, and then the final appearance and size requirements are met through the third process.

In order to enable materials to smoothly flow in the drawing process, the product needs to extend out of a smooth process supplement surface through design software, is designed into a closed or semi-closed digital model in a box shape, then determines the stamping direction of the drawing process, and sets a drawing bead.

At present, the most common drawing schemes for parts such as automobile central channels mainly comprise two drawing schemes, wherein the first drawing scheme is full profile direct drawing, and the second drawing scheme is partial flattening drawing and flanging.

The full profile direct drawing scheme shown in fig. 1 and fig. 2 is characterized in that the external dimension 1400 × 570 × 220mm of the part of the automobile central channel 1' produced by the full profile direct drawing scheme is HC340/590DP, the material thickness is 1.2mm, the size of a plate material is isosceles trapezoid 1460 × 930+1090, and the material utilization rate is 69%. The stamping process is OP10 drawing (to obtain a drawing process piece 2') → OP20 trimming and punching → OP30 shaping → OP40 trimming and punching.

The partial flattening, drawing and re-flanging scheme shown in fig. 3 and 4 is used for producing the automobile central channel 1 ″ with the external dimension 1300 x 500 x 200mm, the material quality of HC340/590DP, the material thickness of 1.0mm, the size of an isosceles trapezoid 1360 x 820 and the material utilization rate of 68%. The stamping process is OP10 drawing → OP20 trimming and punching → OP30 flanging → OP40 trimming and punching.

The two schemes have certain limitations respectively, the full-profile direct drawing process has certain limitation on the structure and material selection of a product, the drawing fracture in the product can be avoided only when the drawing depth of the product is not high (the depth is less than 200mm) and the elongation of the material selection of parts is high, the profile of the product is completely positioned on a male die, the front end and the rear end are in a non-closed state, the planes on the two sides of the product extend out of a process supplement surface, then a material pressing surface is arranged, the height of the material pressing surface is required to be lower than the lowest point of the product, and a corresponding drawing rib is arranged on the material pressing surface; the local flattening, drawing and re-flanging process is suitable for the condition that the flange surfaces on the two sides of the product are linear in characteristic, and the defects of wave wrinkling and the like of the flanging can be avoided.

In addition, the two schemes both need to arrange the draw beads on the drawing material pressing surface to control the material inflow amount and ensure that the product molded surface does not have the wrinkling and material stacking defects, so the size of the plate needs to be properly increased, the material utilization rate is lower, generally 65-75 percent (depending on the product structure), and the production cost is increased.

Disclosure of Invention

The invention aims to provide a drawing and stamping die for an automobile central channel. When the die is used for designing the supplement surface of the drawing process, the additional supplement surface in the traditional drawing process is eliminated, so that the material utilization rate is improved, and the drawing difficulty of a product is reduced.

The invention also aims to provide the automobile central channel drawing and shaping die matched with the automobile central channel drawing and stamping die.

The invention further aims to provide a drawing and stamping technical surface modeling method for the automobile central channel by adopting the drawing and stamping die and the shaping die for the automobile central channel.

In order to achieve the purpose, the invention provides an automobile central channel drawing and stamping die which comprises an upper die holder, a lower die holder, a female die and an upper blank holder which are arranged on the upper die holder, and a male die and a lower blank holder which are arranged on the lower die holder, wherein the lower blank holder is positioned on two sides of the male die; the U-shaped groove is used for drawing and forming a young groove of grooves on two sides of a central channel of the automobile, and meanwhile, the U-shaped groove is used for forming a drawing rib of the die on the pressing surface.

Preferably, the "U" shaped groove is located outside the draw parting line and extends through the nip of the lower bead.

Preferably, in the stamping direction, the "U" -shaped groove is concave.

Preferably, the bottom of the U-shaped groove is in a shape of smooth transition.

Preferably, the depth of the lowest point of the U-shaped groove is less than that of the lowest point of the grooves on two sides of the central channel of the automobile, and the difference between the two is more than or equal to 4 mm.

Preferably, the round angle of the bottom of the U-shaped groove is R18-R22.

Preferably, two first round angles at the opening of the front end part of the U-shaped groove are R8-R12, and two second round angles at the bottom of the front end part of the U-shaped groove are R18-R22.

In order to achieve the other purpose, the invention provides an automobile central channel drawing and shaping die which comprises a shaping upper die holder and a shaping lower die holder, wherein the shaping upper die holder is provided with an upper pressing core positioned in the center and shaping inserts positioned on two sides of the upper pressing core, and the outer side of each shaping insert is provided with an upper pressing ring; the shaping lower die base is provided with a shaping male die positioned in the center and lower edge pressing rings positioned on two sides of the shaping male die; in the shaping process, the shaping insert can draw the rudiment groove into grooves on two sides of a central channel of the automobile.

Preferably, the lower hem ring is located outside the young groove.

In order to achieve the other purpose, the invention provides a drawing and stamping technical surface modeling method for an automobile central channel, which comprises a drawing process, an edge trimming process, a shaping process and a punching and edge trimming process;

in the drawing process, the automobile central channel drawing stamping die is adopted to stamp the plate material to form a drawing process piece, and the drawing process piece is provided with a convex main body part of the automobile central channel and a prototype groove;

in the shaping process, any one of the drawing and shaping dies for the automobile central channel is adopted, and the blank groove is drawn into grooves on two sides of the automobile central channel through shaping.

The invention adjusts the position of a drawing parting line of a drawing stamping die, moves the drawn parting line inwards to the bottom of the side wall of the highest drawing part of a product, designs a molding surface on the outer side of the drawing parting line for forming grooves on two sides of the product into a draw bead molding, namely changes the molding surface of a concave groove on the left side and the molding surface of a concave groove on the right side of the original product into a U-shaped groove, uses the modified U-shaped groove as a draw bead to replace the draw bead of the traditional drawing process, and controls the inflow of material. The groove molding surface of the product is not designed on the male die, but is designed on the material pressing surface, the groove molding is changed into the similar draw bead molding by utilizing the existing molding surface of the product, and the draw bead is replaced to play a role in restricting the material flow, so that the purpose of controlling the material can be achieved on the premise of not increasing the size of the plate, unnecessary process supplement parts outside a product trimming line can be reduced, the material utilization rate is at least improved by 10 percent, the material utilization rate is improved, and the drawing difficulty of the product is reduced.

In an optimal scheme, the molded surface of the product is subjected to smooth transition treatment, the bottom surfaces of the grooves on the two sides can be subjected to large fillet transition, the material inflow resistance is greatly reduced when the drawing delay is carried out, and the cracking defect can be effectively avoided.

The automobile central channel drawing and shaping die and the automobile central channel drawing and stamping die are used in a matched mode, the automobile central channel drawing and stamping technical face molding method adopts the automobile central channel drawing and stamping die and the shaping die, and due to the fact that the automobile central channel drawing and stamping die has the technical effects, the automobile central channel drawing and shaping die and the automobile central channel drawing and stamping technical face molding method also have corresponding technical effects.

Drawings

FIG. 1 is a process flow diagram of an all-profile direct drawing scheme;

FIG. 2 is a schematic structural diagram of a drawing process piece produced in a drawing process by a full-profile direct drawing scheme;

FIG. 3 is a process flow diagram of a partial flattening draw re-turn-ups scheme;

FIG. 4 is a schematic diagram of a drawing process piece made during a drawing process with a partially flattened draw re-turn scheme;

FIG. 5 is a schematic structural diagram of an automobile central channel drawing and stamping die according to an embodiment of the present invention;

FIG. 6 is a schematic drawing die line position view of the automotive center tunnel draw punch of FIG. 5;

FIG. 7 is a cut-away schematic view of a drawing process piece compared to a final product;

FIG. 8 is a partial enlarged view of portion A of FIG. 7;

FIG. 9 is a front end schematic view of a drawing process piece being compared to a final product;

FIG. 10 is a partial enlarged view of portion B of FIG. 9;

FIG. 11 is a schematic structural diagram of an automobile center tunnel drawing and shaping mold according to an embodiment of the present invention;

FIG. 12 is a flowchart of a method for forming a drawing and stamping technical surface of an automobile central channel according to an embodiment of the present invention;

fig. 13 is a schematic structural diagram of an automobile center tunnel product manufactured by the scheme provided by the invention.

In fig. 1 to 4:

automobile central channel 1

In fig. 5 to 13:

1. the automobile central channel 2, the upper die holder 3, the lower die holder 4, the male die 5, the female die 6, the upper blank holder 7, the lower blank holder 8, the drawing die parting line 9, the U-shaped groove 10, the young groove 11, the groove 12, the first fillet 13, the second fillet 21, the shaping upper die holder 22, the shaping lower die holder 23, the upper blank holder 24, the shaping insert 25, the upper blank holder 26, the shaping male die 27, the lower blank holder 7, the shaping upper die holder 22, the shaping female die 23, the shaping male die 27, the lower blank holder 7, the shaping female

Detailed Description

In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

In this document, terms such as "upper, lower, left, right" and the like are established based on positional relationships shown in the drawings, and the corresponding positional relationships may vary depending on the drawings, and therefore, they are not to be construed as absolute limitations on the scope of protection; moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.

Referring to fig. 5 and 6, fig. 5 is a schematic structural view of an automotive central channel drawing and stamping die according to an embodiment of the present invention; fig. 6 is a schematic drawing die line position diagram of the automotive center tunnel drawing and stamping die shown in fig. 5.

In one embodiment, as shown in the drawing and stamping die, the drawing and stamping die for the automobile central channel is used for processing and manufacturing the automobile central channel 1, which mainly comprises an upper die holder 2, a lower die holder 3, a male die 4, a female die 5, an upper blank holder 6, a lower blank holder 7 and the like, wherein, the female die 5 and the upper blank holder 6 are arranged on the upper die holder 2, the male die 4 and the lower blank holder 7 are arranged on the lower die holder 3, the lower blank holder 7 is positioned at two sides of the male die 4, the automobile central channel 1 is approximately shaped like a Chinese character ji on the cross section, two sides are provided with symmetrical horizontal flanges, and the flanging of each side is provided with a groove 11 extending along the longitudinal direction, the improved mould surface of the male mould 4 is used for shaping the convex main body part of the automobile central channel 1, and the drawing parting line 8 of the male mould 4 and the female mould 5 is positioned at the bottom of the side wall of the main body part.

The drawing parting line 8 of the die is moved inwards to the bottom of the side wall of the highest drawing part of the product, so that enough material can be ensured to flow into the cavity in the forming process, and the defect of material fracture is avoided.

The lower edge pressing ring 7 is provided with a U-shaped groove 9 corresponding to grooves on two sides of the automobile central channel 1, the U-shaped groove 9 is positioned on the outer side of the drawing parting line 8 and penetrates through the pressing surface of the lower edge pressing ring 6, and in the stamping process, the U-shaped groove 9 is used for drawing a prototype groove 10 for forming the grooves on two sides of the automobile central channel 1 and forming a drawing rib of a die on the pressing surface.

Referring to fig. 7 and 8, fig. 7 is a schematic sectional view illustrating a drawing process piece and a final product in comparison; fig. 8 is a partially enlarged view of fig. 7.

As shown in the figure, the product surface model outside the drawing parting line 8 is designed into a draw bead model, namely, in the stamping direction, the U-shaped groove 9 is concave, the bottom of the U-shaped groove is in a smooth transition shape, two first fillets 12 at the opening of the U-shaped groove 9 are R8-R12, the fillet size of the bottom 9 of the U-shaped groove is R18-R22, the depth of the lowest point of the U-shaped groove 9 is smaller than the depth of the lowest point of the grooves 11 at two sides of the automobile central channel 1, and the difference between the two is larger than or equal to 4 mm.

For example, the lowest point of the concave shape is 4.4mm higher than the product, and the size of the fillet is R20. Therefore, the situation that the part trimmed by the drawing process piece cannot be placed in place when the part is placed into the shaping process male die can be prevented.

Referring to fig. 9 and 10 together, fig. 9 is a front end schematic view of a drawing process piece and a final product for comparison; fig. 10 is a partially enlarged view of fig. 9.

As shown in the figure, in consideration of the change of the recess 11 of the center tunnel 1 of the vehicle in the front end becoming shallow and wide, the front end of the U-shaped groove 9 corresponding thereto is no longer smoothly transited by the semicircular round angle, but has a flat portion at the bottom and two second round angles at both sides of the flat portion, wherein the two first round angles 12 at the opening of the front end portion of the U-shaped groove 9 are R8-R12, and the two second round angles 13 at the bottom of the front end portion of the U-shaped groove 9 are R18-R22.

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, which enlarge the fillets, and the larger the fillet is, the more favorable the material flows in, so that the groove shape is easily realized during reshaping.

Referring to fig. 11, fig. 11 is a schematic structural view of a drawing and shaping mold for an automotive center tunnel according to an embodiment of the present invention.

In order to achieve the other purpose, the invention provides a drawing and shaping die for an automobile central channel, which mainly comprises an upper shaping die holder 21, a lower shaping die holder 22, an upper swaging core 23, a shaping insert 24, an upper blank holder 25, a shaping male die 26, a lower blank holder 27 and the like.

The upper swaging core 23 is arranged at the central position of the shaping upper die holder 21, the shaping insert 24 is positioned at two sides of the upper swaging core 23, the upper blank holders 25 are arranged at the outer side of the shaping insert 24, the shaping convex die 26 and the lower blank holder 27 are arranged at the shaping lower die holder 22, the shaping convex die 26 is positioned at the center of the shaping lower die holder 22, the lower blank holders 27 are positioned at two sides of the shaping convex die 26, the lower blank holders 27 are positioned at the outer side of the blank groove 10, the blank groove 10 on the drawing process part can be plastically deformed by performing blank holder design at the outer side of the blank groove 10, and the shaping insert 24 can draw the blank groove 10 on the drawing process part into the grooves 11 at two sides of the central passage of the automobile in the.

The above embodiments are merely preferred embodiments of the present invention, and are not limited thereto, and on the basis of the above embodiments, various embodiments can be obtained by performing targeted adjustment according to actual needs. For example, the size of the transition fillet of the U-shaped groove 9 is adjusted, or the shapes of the male die 4 and the shaping male die 26 are different according to different actual products, and the like. This is not illustrated here, since many implementations are possible.

Referring to fig. 12 and 13, fig. 12 is a flowchart illustrating a method for forming a drawing and stamping process surface of an automobile central channel according to an embodiment of the present invention; fig. 13 is a schematic structural diagram of an automobile center tunnel product manufactured by the scheme provided by the invention.

As shown in the figure, the material of the automobile center channel 1 product is generally B340/590DP, the material thickness is generally 1.0-1.2, and the automobile center channel 1 product is completed through four stamping processes: OP10 drawing → OP20 trimming → OP30 shaping → OP40 punching and trimming, wherein the drawing and shaping process is most important to the quality of the part.

The invention provides a method for molding a drawing and stamping technical surface of an automobile central channel, which abandons the former molding method and is fundamentally different from the traditional method, the drawing process does not draw the groove molding on two sides at one time, but draws most of product surfaces firstly, and then draws the grooves on two sides on the basis of a prototype groove through shaping, and the method comprises the following steps:

OP10 draw process — this process is the first process of stamping and is the most critical process of stamping and forming. When the automobile central channel drawing and stamping die works, a flat rectangular plate is placed on a lower edge pressing ring 7 of a lower die of the drawing die, the plate slowly fits the die surface in the descending process of a press machine, and when the plate reaches the lowest point, a drawing working procedure piece is obtained and is provided with a convex main body part of an automobile central channel 1 and a prototype groove 10.

OP20 edging process, in this process, the edge of the drawn workpiece is treated to remove the excess part around the edge.

OP30 reforming process-in this process, any one of the drawing and reforming dies for the central passage of the automobile is used to draw the young groove 10 into the grooves 11 on both sides of the central passage of the automobile by reforming, so as to obtain a reformed workpiece.

OP40 punching and trimming process, in which the required hole site is punched and formed in the shaping process, and the edge of the drawn workpiece is processed to cut off the part beyond the product boundary.

The invention changes the molding surface of the concave grooves on the left and right sides of the original product into the U-shaped grooves 9, uses the modified U-shaped grooves 9 as draw beads to replace the draw beads of the traditional drawing process, and controls the material inflow. The product groove molding surface is not designed on a male die, but is designed on a material pressing surface, the groove molding is changed into the similar draw bead molding by utilizing the existing molding surface of the product, the draw bead is replaced to play a role in restricting the material flow, the purpose of controlling the material can be achieved on the premise of not increasing the size of a plate material, unnecessary process supplement parts outside a product trimming line can be reduced, the material utilization rate is at least improved by 10 percent, the material utilization rate is improved, the drawing difficulty of the product is reduced, and the die is well applicable to various types of middle channel products.

The drawing and stamping die, the shaping die and the technical surface modeling method for the automobile central channel provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. A drawing and stamping die for an automobile central channel comprises an upper die holder (2), a lower die holder (3), a female die (5) and an upper blank holder (6) which are arranged on the upper die holder (2), and a male die (4) and a lower blank holder (7) which are arranged on the lower die holder (3), wherein the lower blank holder (7) is positioned on two sides of the male die (4), the drawing and stamping die drawing die parting line (8) of the male die (4) and the female die (5) is positioned at the bottom of the side wall of the main body part, and the lower blank holder (7) is provided with a U-shaped groove (9) corresponding to grooves (11) on two sides of the automobile central channel (1); the U-shaped groove (9) is used for drawing and forming a prototype groove (10) of a groove (11) on two sides of the central channel (1) of the automobile, and the U-shaped groove (9) is used for forming a drawing rib of the die on the pressing surface.

2. The automotive centre channel draw stamping die according to claim 1, characterised in that the "U" -shaped groove (9) is located outside the draw parting line (8) and runs through the nip of the lower bead ring (7).

3. Drawing and stamping die for automobile central channels, according to claim 2, characterized in that the "U" -shaped groove (9) is concave in shape in the stamping direction.

4. Drawing and stamping die for automobile central channels, according to claim 3, characterized in that the bottom of the "U" shaped groove (9) is in the shape of a rounded transition.

5. Drawing and stamping die for automobile central channels, 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 point of the groove on both sides of the automobile central channel, and the difference between the two is more than or equal to 4 mm.

6. The automobile central channel drawing and stamping die as claimed in claim 4, wherein the rounded corner of the bottom of the U-shaped groove (9) is R18-R22.

7. The automotive center channel drawing and stamping die as claimed in claim 4, wherein 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. The drawing and shaping die for the automobile central channel is characterized by comprising an upper shaping die holder (21) and a lower shaping die holder (22), wherein the upper shaping die holder (21) is provided with an upper material pressing core (23) positioned in the center and shaping inserts (24) positioned at two sides of the upper material pressing core (23), and the outer side of each shaping insert (24) is provided with an upper edge pressing ring (25); the shaping lower die holder (22) is provided with a shaping convex die (26) positioned in the center and lower edge pressing rings (27) positioned on two sides of the shaping convex die (26); in the shaping process, the shaping insert (24) can draw the young groove (10) into grooves (11) on two sides of the central channel (1) of the automobile.

9. The automotive center tunnel draw-shaping die of claim 8, wherein the lower bead ring (27) is located outside the young groove (10).

10. A drawing and stamping technical surface modeling method for an automobile central channel is characterized by comprising a drawing process, an edge trimming process, a shaping process and a punching and edge trimming process;

in a drawing process, the automobile central channel drawing stamping die as claimed in any one of claims 1 to 7 is adopted to stamp the sheet material to form a drawing process piece, wherein the drawing process piece is provided with a convex main body part of the automobile central channel (1) and a young groove (10);

in the shaping process, the automotive center channel drawing shaping die of claim 8 or 9 is used for drawing the young-shaped groove (10) into the grooves (11) on two sides of the automotive center channel (1) through shaping.