Deep drawing die and deep drawing process

Abstract

The application discloses a deep drawing die and a deep drawing process for deep drawing a long strip-shaped part with a large end and a small end, the deep drawing die comprises a punch and a die, the punch and the die comprise punch forming parts and die forming parts matched with the part to be processed, the punch forming parts and the die forming parts continue to extend in the length direction to form punch process modeling parts and die process modeling parts corresponding to the small end, the middle part of the die process modeling part is recessed to form at least one die middle recess with an outer end opening, and the punch process modeling part is provided with a punch middle recess or a punch middle through groove with an outer end opening corresponding to the die middle recess. The die and the punch with the open process modeling part structure can increase the cross-sectional length in the width direction, control the inflow amount and direction of the sheet metal in the width direction, and absorb the excess sheet metal, so that the phenomenon of local wrinkling of the part to be processed at the small end is reduced or even eliminated, mold damage is avoided, and production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of deep drawing forming, in particular to a deep drawing forming die and a deep drawing forming process. BACKGROUND

[0002] As shown in Figure 1 , Figure 1 is a schematic view of a concave die for deep drawing a central passage of an automobile.

[0003] The concave die 01 comprises a forming part 011 and a blank holder part 012, the forming part 011 is raised relative to the blank holder part 012, and is used for forming the raised part of the automobile central passage to be processed. The raised part of the automobile central passage has a small end at one end and a large end at the other end, and the forming part 011 is correspondingly provided with a small end 011a and a large end 011b. Figure 1 The forming part 011 extends and smoothly transitions to form a curved surface at a position corresponding to the small end 011a, and then extends downward to connect to the blank holder part 012 at the end, so as to form a modeling part 013 with a semi-closed cavity, so as to complete the small end stamping process profile modeling. The concave die 01 is provided with a local pit 012a and a drawing rib in the blank holder part 012, so as to increase the flow resistance of the sheet metal. The structure of the convex die can be understood by reference.

[0004] However, the above-mentioned die still has local wrinkling phenomenon at the position of the forming part 011 in the actual production process. SUMMARY

[0005] The present application provides a deep drawing forming die for deep drawing forming a long strip-shaped part with a large end and a small end, the deep drawing forming die comprises a convex die and a concave die, the convex die and the concave die comprise a convex die forming part and a concave die forming part matched with the part to be processed, the convex die forming part and the concave die forming part continue to extend in the length direction to form a convex die process modeling part and a concave die process modeling part corresponding to the small end, and the middle part of the concave die process modeling part is recessed to form at least one concave die middle recess with an open outer end, and the convex die process modeling part is provided with a convex die middle recess or a convex die middle through groove corresponding to the concave die middle recess.

[0006] Optionally, the convex die process modeling part forms one convex die middle recess or convex die middle through groove, and the convex die process modeling part simultaneously forms convex die side part protrusions extended from both sides of the convex die forming part on both sides of the convex die middle recess or convex die middle through groove, and the notch direction of the convex die side part protrusions is the same as the recess direction of the convex die forming part;

[0007] The concave die process forming part forms a concave die middle groove in the concave die, and the concave die process forming part forms a concave die side protrusion extending from both sides of the concave die forming part on both sides of the concave die middle groove, the notch direction of the concave die side protrusion is the same as the notch direction of the concave die forming part, and is opposite to the notch direction of the concave die middle groove.

[0008] Optionally, the depth of the convex die middle through groove or the convex die middle groove, and the height of the convex die side protrusion are the same as the height of the small end of the convex die forming part; the depth of the concave die middle groove and the height of the concave die side protrusion are the same as the height of the small end of the concave die forming part.

[0009] Optionally, the drawing forming die comprises an upper die assembly and a lower die assembly, the upper die assembly comprises the concave die, the concave die comprises a concave die pressing part which is integrally formed with the concave die forming part, and the lower die assembly comprises the convex die and a lower die pressing part, and the end of the concave die pressing part and the end of the lower die pressing part are flush with the end of the convex die forming part and the end of the concave die forming part.

[0010] Optionally, the concave die pressing part and the lower die pressing part are respectively provided with a lower die drawing rib and a concave die drawing rib which extend along the length direction at one end corresponding to the small end.

[0011] Optionally, the lower die pressing part and the concave die pressing part are respectively provided with a lower die long groove and a concave die long groove, the lower die long groove and the concave die long groove penetrate through the corresponding lower die pressing part and the concave die pressing part along the length direction, and the lower die long groove is arranged at positions corresponding to both sides of the convex die forming part, and the concave die long groove is arranged at positions corresponding to both sides of the concave die forming part.

[0012] Optionally, the lower die long groove corresponds to the boundary between the lower die pressing part and the convex die forming part, and the concave die long groove corresponds to the boundary between the concave die pressing part and the concave die forming part.

[0013] Optionally, the lower die pressing part is integrally formed with the convex die process forming part and the convex die forming part.

[0014] Optionally, the convex die process forming part is provided with the convex die middle through groove corresponding to the concave die middle groove; and the lower die pressing part comprises a lower die pressing plate corresponding to the top of the convex die middle through groove.

[0015] Optionally, the long strip-shaped part is a central channel of an automobile.

[0016] The application further provides a drawing forming process based on the drawing forming die in the eighth aspect, and the drawing forming process comprises the following steps:

[0017] placing the sheet between the concave die and the lower die pressing part;

[0018] the concave die and the lower die pressing part move relatively to compact the sheet;

[0019] the concave die and the convex die move relatively to draw the primary product of the long strip-shaped part;

[0020] cutting off the excess part of the primary product;

[0021] forming the long strip-shaped part.

[0022] The drawing forming die and the drawing forming process in the present application can control the flow speed of the middle sheet, and more importantly, can absorb the excess sheet when forming the small end, because the concave process shaping part and the convex process shaping part extend forward from the corresponding forming part and are concave in the middle. The whole concave process shaping part and convex process shaping part are open type design with open ends, and the sheet flow direction is mainly along the width direction, so it is not easy to accumulate together to form wrinkles. It can be seen that the concave die and the convex die with open type process shaping part structure can increase the cross-sectional length of the process shaping part in the width direction, control the inflow amount and direction of the sheet in the width direction, and absorb the excess sheet, thereby reducing or even eliminating the local wrinkling phenomenon of the part to be processed at the small end in the drawing process, avoiding damage to the die, improving production efficiency, reducing production cost, and realizing normal batch production of the part to be processed.

[0023] Moreover, because the extended process shaping part is used as a pressing material at the same time, the pressing effect is better, so the required pressing surface of the small end in the length direction of the part can be reduced, the size of the sheet required for stamping is significantly reduced, thereby improving the material utilization rate, reducing production cost, improving economic benefit and market competitiveness. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a schematic view of a concave die for drawing an automobile central channel;

[0025] Figure 2 is a structural schematic view of the automobile central channel drawn by the drawing forming die in the embodiment of the present application;

[0026] Figure 3 is a structural schematic view of the concave die in the embodiment of the present application;

[0027] Figure 4 is Figure 3 a profile schematic view of the end part of the concave die;

[0028] Figure 5 is Figure 3 a schematic view of the end part of the concave die;

[0029] Figure 6 Fig. 1 is a schematic view of the structure of the punch forming part and the punch process modeling part in the embodiment of the present application;

[0030] Figure 7 Fig. 2 is a schematic view of the end of the punch forming part and the punch process modeling part in the embodiment of the present application; Figure 6

[0031] Figure 8 Fig. 3 is a schematic view of the lower die pressing part in the embodiment of the present application.

[0032] Figures 1-8 The reference signs in the drawings are explained as follows:

[0033] 01 - punch; 011 - forming part; 011a - small end; 011b - large end; 012 - pressing part; 012a - pit; 013 - modeling part;

[0034] 1 - punch;

[0035] 11 - punch forming part; 111 - small end; 112 - large end;

[0036] 12 - lower die pressing part; 121 - lower die drawing rib; 122 - lower die long groove; 123 - lower die pressing plate;

[0037] 13 - punch process modeling part; 131 - punch middle part through groove; 131a - peripheral wall; 132 - punch side part protrusion;

[0038] 2 - punch;

[0039] 21 - punch forming part; 212 - large end; 211 - small end;

[0040] 22 - punch pressing part; 221 - punch drawing rib; 222 - punch long groove;

[0041] 23 - punch process modeling part; 231 - punch middle part groove; 231a - bottom wall; 231b - peripheral wall; 232 - punch side part protrusion;

[0042] 3 - automobile central passage; 31 - passage edge; 32 - raised part; 322 - large end; 321 - small end. DETAILED DESCRIPTION

[0043] In order for those skilled in the art to better understand the technical solutions of the present application, the present application is further described in detail below in combination with the drawings and specific embodiments.

[0044] The deep drawing forming die is used for deep drawing forming a long strip-shaped part with a large end and a small end, and the long strip-shaped part in the embodiment is an automobile central passage 3, as shown in Figure 2 ,​Figure 2 Structure diagram of automobile central channel 3 formed by deep drawing forming die in the embodiment of the present application.

[0045] The automobile central channel 3 is raised in the middle to form a raised portion 32, the raised portion 32 constitutes the main body of the automobile central channel 3, and the two sides of the raised portion 32 are channel edges 31, Figure 2 The left end of the raised portion 32 of the automobile central channel 3 has a certain slope and is tapered to the middle, thus forming a small end, and the other end is a large end. It is found that the flow amount required by the sheet metal at the small end is less, but the initial sheet metal in the small end and the large end of the deep drawing forming die is the same, so the initial sheet metal at the small end is actually excessive, and the modeling portion 013 position in the background technology cannot consume the excessive sheet metal, thereby causing serious local accumulation of sheet metal, leading to serious wrinkling of the processed part and damage to the die, and it is difficult to realize batch production.

[0046] Please continue to refer to Figures 3-5 , Figure 3 Structure diagram of the die 2 in the embodiment of the present application; Figure 4 is Figure 3 Contour diagram of the end of the die 2 in the embodiment of the present application; Figure 5 is Figure 3 Diagram of the end of the die 2 in the embodiment of the present application; Figure 6 Structure diagram of the punch forming portion 11 and the punch process modeling portion 13 in the embodiment of the present application; Figure 7 is Figure 6 Diagram of the end of the punch forming portion 11 and the punch process modeling portion 13 in the embodiment of the present application.

[0047] The deep drawing forming die includes a punch 1 and a die 2, the punch 1 and the die 2 include a punch forming portion 11 and a die forming portion 21 matched with the processed part, as shown in Figure 3 , 6 The die forming portion 21, the punch forming portion 11 and the raised portion 32 of the automobile central channel 3 are matched, so there is a small end 211 and a small end 111 matched with the small end 321 of the raised portion 32. It is worth noting that in the embodiment, the small end 111 of the punch forming portion 11 and the small end 211 of the die forming portion 21 continue to extend in the length direction to form a punch process modeling portion 23 and a die process modeling portion 13, and the punch process modeling portion 23 and the die process modeling portion 13 need to be cut off after the deep drawing step.

[0048] As Figures 3-5As shown, the middle part of the die forming part 23 is recessed to form a die center groove 231. The groove opening of the die center groove 231 faces upward. Since the entire middle part of the die forming part 23 is recessed downward, a bottom wall 231a and a U-shaped peripheral wall 231b with an outer end opening are formed after the recess. That is, the outer end opening of the die center groove 231 is the end of the die forming part 23 that is away from the die forming part 21 along the length direction.

[0049] Let's look again. Figure 6 The punch forming section 13 has a punch central through groove 131 corresponding to the die central groove 231. It is basically the same as the die central groove 231, except that the punch central through groove 131 has no bottom wall and is a through groove structure. The punch central through groove 131 also has an open outer end, which is the end of the punch forming section 13 furthest from the punch forming section 11. The peripheral wall 131a of the punch central through groove 131 is also U-shaped. In essence, both the die forming section 23 and the punch forming section 13 are open-type forming structures with open outer ends.

[0050] Furthermore, since both the die forming section 23 and the punch forming section 13 are formed by extending from their respective forming sections, and the forming section corresponds to the raised section 32 of the central channel 3 of the car and has a certain height, the sides of the recessed central groove 231 of the die will form side protrusions 232 of the die with the same height as the forming section. The side protrusions 232 of the die are equivalent to forming bulges on both sides of the central groove 231 of the die. These bulges are extensions formed by extending from both sides of the forming section 21 of the die. Therefore, the side protrusions 232 of the die are groove structures, and the groove direction is the same as the notch direction of the forming section 21 of the die. Specifically, in Figure 3 When the center is facing downwards, the groove direction of the protrusion 232 on the side of the die is opposite to the groove direction of the groove 231 in the middle of the die. The depth of the protrusion 232 on the side of the die and the groove 231 in the middle of the die are the same as the height of the small end 211 of the die forming part 21. The sameness mentioned in this article does not require complete equality. Due to the deviation of the process, it is acceptable to be slightly higher or slightly lower.

[0051] Correspondingly, on both sides of the through groove 131 in the middle of the punch, punch side protrusions 132 will be formed simultaneously. The punch side protrusions 132 are extensions formed by extending from both sides of the punch forming part 11. Therefore, the punch side protrusions 132 have a slot structure, and the slot direction is the same as the recess direction of the entire punch forming part 13. Specifically, in Figure 6 In the middle, the slot of the punch side protrusion 132 faces downward, and the depth of the punch side protrusion 132 and the punch middle through groove 131 is the same as the height of the small end 111 of the punch forming part 11.

[0052] Please continue reading. Figure 8 , Figure 8This is a schematic diagram of the lower die pressing part 12 in the lower die assembly of an embodiment of the present invention. Figure 8 The main part is a schematic diagram of the surface of the lower die pressing part 12.

[0053] In this embodiment, the deep drawing die actually includes an upper die assembly and a lower die assembly. The lower die assembly includes a separately configured punch 1 and a lower die blanking part 12. The punch 1 includes... Figure 6 The punch forming part 11 and the punch process shaping part 13 are integrated in the middle, and the blank holder 12 is... Figure 8 The components for pressing material shown include a lower die assembly with a base, a pressing part 12 and a punch 1 both disposed on the base (not shown in the figure), an upper die assembly with a base, and the aforementioned die 2 also disposed on the base.

[0054] Let's look again. Figure 3 The die 2 also includes a die blanking part 22, but the die blanking part 22, the die forming part 21, and the die process shaping part 23 are integrally formed. When the die forming part 21 extends along the length direction to form the die process shaping part 23, the die blanking part 22 extends forward at the same time, such as... Figure 3 As shown, the length of the die blanking part 22 extends to be flush with the die process shaping part 23. For the split punch 1, the lower die blanking part 12 located on both sides of the punch forming part 11 also extends to be flush with the punch process shaping part 13.

[0055] In this embodiment, the deep drawing die undergoes the following steps during the deep drawing process:

[0056] The sheet metal is placed between the upper cavity 2 and the lower die pressing part 12;

[0057] The die 2 and the lower die pressing part 12 move relative to each other to press the sheet metal. For example, the die 2 can move downwards and approach the lower die pressing part 12 until the sheet metal is pressed.

[0058] Then, the die 2 and the punch 1 move relative to each other, for example, the lower punch forming part 11 moves upward. As the relative movement between the two continues, the sheet metal is drawn into the primary product of the automotive central tunnel 3.

[0059] Finally, after removing the excess parts of the primary product, other processing can be performed, such as edge shaping, to ultimately form the central tunnel 3 of the car. It can be understood that the punch 1 and the die 2 are in a relative motion relationship; either one can move. Furthermore, it is not limited to the punch 1 being located below; the die 2 can also be located below. This solution does not impose any specific restrictions.

[0060] Combined with appendix Figure 3 , 5It can be understood that the shape change of the sheet metal during the deep drawing process, when the sheet metal is drawn, the concave part process modeling part 23 and the convex part process modeling part 13 extend forward from the corresponding forming part, and the middle part is depressed, forming the concave side protrusion 232 and the convex side protrusion 132 on both sides, which can control the flow of the sheet metal on the side to the middle. For the sheet metal in the middle before drawing, the concave part groove 231 and the convex part through groove 131 can not only control the flow speed of the middle sheet metal, but also, more importantly, can absorb the excess sheet metal during the forming of the small end. The entire concave part process modeling part 23 and convex part process modeling part 21 are open type design with open end, and the flow direction of the sheet metal is mainly along the width direction, which is not easy to accumulate together to form wrinkles. It can be seen that the concave die 2 and the convex die 1 with the open type process modeling part structure can increase the cross-sectional length of the process modeling part in the width direction, control the inflow amount and direction of the sheet metal in the width direction, and absorb the excess sheet metal, thereby reducing or even eliminating the local wrinkling phenomenon of the part to be processed at the small end in the drawing process, avoiding mold damage, improving production efficiency, and reducing production cost, so as to realize normal batch production of the part to be processed.

[0061] Moreover, since the extended process modeling part is also used as a pressure material, and the pressure material effect is better, the required pressure surface of the small end in the length direction of the part can be reduced, the size of the sheet metal required for stamping is significantly reduced, thereby improving the material utilization rate, reducing production cost, improving economic benefit and market competitiveness. For the automobile central channel, the size of the sheet metal in the length direction is significantly reduced, and the material utilization rate can be improved by about 4%.

[0062] In the above embodiment, the concave die process modeling part 23 and the convex die process modeling part 13 are depressed in the middle part to form a middle part groove and a middle part through groove. It can be understood that more side protrusions can also be provided, and the corresponding side protrusions are also more. Similarly, the flow resistance and the absorption of excess sheet metal can also be increased. However, the concave die middle part groove 231 and the convex die middle part through groove 131 can already improve the local wrinkling phenomenon and do not affect the smoothness of the sheet metal flow, and can better ensure the quality of the part to be processed during the deep drawing process.

[0063] Please continue to check Figure 3 , 5, the lower die pressing part 12 and the concave die pressing part are respectively provided with a lower die long groove 122 and a concave die long groove 222, the lower die long groove 122 and the concave die long groove 222 are through the corresponding lower die pressing part 12 and concave die pressing part 22 along the length direction, and the lower die long groove 122 is arranged corresponding to the both sides of the male die forming part 11, and the concave die long groove 222 is arranged corresponding to the both sides of the concave die forming part 21. The lower die long groove 122 and the concave die long groove 222 can increase the flow resistance of the plate in the deep drawing process, control the flow speed of the plate, slow down the speed of the plate flowing into the mold cavity, and reduce and avoid the wrinkling of the automobile central channel.

[0064] In addition, the concave die pressing part 22 and the lower die pressing part 12 are respectively provided with a lower die drawing rib 121 and a concave die drawing rib 221 at one end corresponding to the small end, the lower die drawing rib 121 and the concave die drawing rib 221 are arranged outside the corresponding lower die long groove 122 and concave die long groove 222 along the length direction, and also slow down the speed of the plate flowing into the mold cavity.

[0065] In the above embodiment, the male die process modeling part 13 is provided with a male die middle part through groove 131 corresponding to the concave die middle part groove 231, at this time, the lower die pressing part 12 can also include a lower die pressing plate 123 corresponding to the top of the male die middle part through groove 131, so as to more reliably press the plate before deep drawing. It can be understood that the middle part of the male die process modeling part 13 can also be a male die middle part groove corresponding to the concave die middle part groove 231, and is not limited to the through groove structure.

[0066] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. A drawing die for drawing forming a long strip-shaped part having a large end with a protrusion and a small end, the drawing die comprising a punch (1) and a die (2), the punch (1), the die (2) comprising a punch forming portion (11), a die forming portion (21) matching the part to be processed, characterized in that, The punch forming part (11) and the die forming part (21) continue to extend along the length direction to form a punch process forming part (13) and a die process forming part (23) corresponding to the small end part, and the middle part of the die process forming part (23) is recessed to form at least one die middle recess (231) with an open outer end, and the punch process forming part (13) is provided with a punch middle recess or a punch middle through groove (131) corresponding to the die middle recess (231); The punch process forming part (13) forms a punch middle recess or a punch middle through groove (131), and the punch process forming part (13) is provided with punch side protrusions (132) extending from both sides of the punch forming part (11) on both sides of the punch middle recess or the punch middle through groove (131), and the notch direction of the punch side protrusions (132) is the same as the recess direction of the punch forming part (11); The die process forming part (23) forms a die middle recess (231), and the die process forming part (23) is provided with die side protrusions (232) extending from both sides of the die forming part (21) on both sides of the die middle recess (231), and the notch direction of the die side protrusions (232) is the same as the recess direction of the die forming part (21) and opposite to the notch direction of the die middle recess (231); The depth of the punch middle through groove (131) or the punch middle recess, and the height of the punch side protrusions (132) are the same as the height of the small end of the punch forming part (11); the depth of the die middle recess (231) and the height of the die side protrusions (232) are the same as the height of the small end of the die forming part (21).

2. The draw-forming die of claim 1 wherein, The drawing forming die comprises an upper die assembly and a lower die assembly, the die (2) of the upper die assembly comprises a die blanking part (22) which is integrally formed with the die forming part (21), the lower die assembly comprises the punch (1) and a lower die blanking part (12), the end of the die blanking part (22) is flush with the end of the die process forming part (23), and the end of the lower die blanking part (12) is flush with the end of the punch process forming part (13).

3. The draw-forming die of claim 2 wherein, The die blanking part (22) and the lower die blanking part (12) are respectively provided with a lower die drawing rib (121) and a die drawing rib (221) extending along the length direction at one end corresponding to the small end.

4. The draw-forming die of claim 2 wherein, The lower die blanking part (12) and the die blanking part (22) are respectively provided with a lower die long groove (122) and a die long groove (222), the lower die long groove (122) and the die long groove (222) extend through the corresponding lower die blanking part (12) and die blanking part (22) along the length direction, and are provided with the lower die long groove (122) corresponding to both sides of the punch forming part (11) and the die long groove (222) corresponding to both sides of the die forming part (21).

5. The draw-forming die of claim 4 wherein, The lower die long groove (122) corresponds to the boundary between the lower die blanking part (12) and the male die forming part (11), and the female die long groove (222) corresponds to the boundary between the female die blanking part (22) and the female die forming part (21).

6. The draw-forming die of claim 2 wherein, The lower die blanking part (12) is arranged separately from the integral male die process modeling part (13) and the male die forming part (11).

7. The draw-forming die of claim 6 wherein, The male die process modeling part (13) is provided with the male die middle through groove (131) corresponding to the female die middle groove (231), and the lower die blanking part (12) comprises a lower die blanking plate (123) corresponding to the top of the male die middle through groove (131).

8. The draw-forming die of any one of claims 1-7, wherein, The long strip-shaped part is an automobile central channel (3).

9. Deep drawing process based on the deep drawing die according to claim 6, characterized in that The method comprises the following steps: Placing the sheet between the female die (2) and the lower die blanking part (12); The female die (2) and the lower die blanking part (12) move relative to each other to compress the sheet; The female die (2) and the male die (1) move relative to each other to draw the primary product of the long strip-shaped part; Cutting off the excess part of the primary product; Forming the long strip-shaped part.

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